[{"id":3680230,"web_url":"http://patchwork.ozlabs.org/comment/3680230/","msgid":"<20260422071541-9a295128-d913-418f-a21c-1386fca30290@linutronix.de>","date":"2026-04-22T05:56:56","subject":"Re: New warning in linus/master","submitter":{"id":87994,"url":"http://patchwork.ozlabs.org/api/people/87994/","name":"Thomas Weißschuh","email":"thomas.weissschuh@linutronix.de"},"content":"Hi Ricardo,\n\nOn Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n> Media-CI has found a couple of new warnings in the latest kernel\n> version for aarch64 and powerpc. They get fixed with this patch and\n> before moving I wanted to know if this was under your radar.\n\nThanks for the report. I was not aware of these so far.\n\n> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n> index 7dec05dd33b7..65914842fae0 100644\n> --- a/arch/arm64/kernel/vdso/Makefile\n> +++ b/arch/arm64/kernel/vdso/Makefile\n> @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n> CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n> \n> ifneq ($(c-gettimeofday-y),)\n> - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> -Wno-maybe-uninitialized\n> endif\n\n(...)\n\nI'd like to know exactly what is going on before suppressing the warning.\nIt is a non-standard warning, only enabled by *some* of the vDSO builds\nfor some reason.\n\n> https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc\n\nWhile I was able to download a configuration from this job and also use the\nsame container image, I can not reproduce the issue. Is the configuration the\nfull one or only the template?\n\nCould you provide full reproduction steps?\n\n> CONFIG_CC_VERSION_TEXT=\"aarch64-linux-gnu-gcc (Debian 15.2.0-16) 15.2.0\"\n\nThe linked test log shows GCC 14.2, not 15.2.\nNot that I could reproduce it with either one...\n\n> SYNC include/config/auto.conf\n> CC arch/arm64/kernel/vdso/vgettimeofday.o\n> In file included from :\n> In function ‘vdso_set_timespec’,\n> inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,\n> inlined from ‘__cvdso_clock_gettime_common’ at\n> /workdir/lib/vdso/gettimeofday.c:293:10,\n> inlined from ‘__cvdso_clock_gettime_data.constprop’ at\n> /workdir/lib/vdso/gettimeofday.c:306:7:\n> /workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used\n> uninitialized [-Wmaybe-uninitialized]\n> 104 | ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);\n> | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> /workdir/lib/vdso/gettimeofday.c: In function\n> ‘__cvdso_clock_gettime_data.constprop’:\n> /workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here\n> 242 | u64 sec, ns;\n> | ^~~\n\nThe same pattern is used in some other do_ handlers, which do not generate this\nwarning. I also can't immediately see what is wrong.\n\n(...)\n\n\nThomas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256\n header.s=2020 header.b=z5IC0+ha;\n\tdkim=pass header.d=linutronix.de header.i=@linutronix.de\n header.a=ed25519-sha256 header.s=2020e header.b=+vmzERty;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19926-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2a0a:51c0:0:12e:550::1\"","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linutronix.de","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256\n header.s=2020 header.b=z5IC0+ha;\n\tdkim=pass header.d=linutronix.de header.i=@linutronix.de\n header.a=ed25519-sha256 header.s=2020e header.b=+vmzERty;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=linutronix.de\n (client-ip=2a0a:51c0:0:12e:550::1; 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charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"\n ","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680244,"web_url":"http://patchwork.ozlabs.org/comment/3680244/","msgid":"","date":"2026-04-22T07:00:11","subject":"Re: New warning in linus/master","submitter":{"id":80459,"url":"http://patchwork.ozlabs.org/api/people/80459/","name":"Ricardo Ribalda","email":"ribalda@chromium.org"},"content":"Hi Thomas\n\nThanks for the prompt reply\n\nOn Wed, 22 Apr 2026 at 13:57, Thomas Weißschuh\n wrote:\n>\n> Hi Ricardo,\n>\n> On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n> > Media-CI has found a couple of new warnings in the latest kernel\n> > version for aarch64 and powerpc. They get fixed with this patch and\n> > before moving I wanted to know if this was under your radar.\n>\n> Thanks for the report. I was not aware of these so far.\n>\n> > diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n> > index 7dec05dd33b7..65914842fae0 100644\n> > --- a/arch/arm64/kernel/vdso/Makefile\n> > +++ b/arch/arm64/kernel/vdso/Makefile\n> > @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n> > CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n> >\n> > ifneq ($(c-gettimeofday-y),)\n> > - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > -Wno-maybe-uninitialized\n> > endif\n>\n> (...)\n>\n> I'd like to know exactly what is going on before suppressing the warning.\n> It is a non-standard warning, only enabled by *some* of the vDSO builds\n> for some reason.\n>\n> > https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc\n>\n> While I was able to download a configuration from this job and also use the\n> same container image, I can not reproduce the issue. Is the configuration the\n> full one or only the template?\n>\n> Could you provide full reproduction steps?\n\nYou can try repro with:\n\nwork/linux $ podman run -v .:/workdir/ --rm -it\nregistry.freedesktop.org/linux-media/media-ci/build:latest\n$ cd /workdir\n$ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n$ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\narch/arm64/kernel/vdso/vgettimeofday.o\n\nThe gcc version discrepancy is because I the error was due to old gcc\nversion and I was playing around with that... but it fails in both\ngcc14 and gcc15\n\nYou can try with debian testing with\nwork/linux$ podman run -v .:/workdir/ --rm -it debian:testing\n$ apt-get update\n$ apt-get install gcc-aarch64-linux-gnu build-essential flex bison libssl-dev bc\n$ cd /workdir\n$ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n$ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\narch/arm64/kernel/vdso/vgettimeofday.o\n\nRegards!\n\n>\n> > CONFIG_CC_VERSION_TEXT=\"aarch64-linux-gnu-gcc (Debian 15.2.0-16) 15.2.0\"\n>\n> The linked test log shows GCC 14.2, not 15.2.\n> Not that I could reproduce it with either one...\n>\n> > SYNC include/config/auto.conf\n> > CC arch/arm64/kernel/vdso/vgettimeofday.o\n> > In file included from :\n> > In function ‘vdso_set_timespec’,\n> > inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,\n> > inlined from ‘__cvdso_clock_gettime_common’ at\n> > /workdir/lib/vdso/gettimeofday.c:293:10,\n> > inlined from ‘__cvdso_clock_gettime_data.constprop’ at\n> > /workdir/lib/vdso/gettimeofday.c:306:7:\n> > /workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used\n> > uninitialized [-Wmaybe-uninitialized]\n> > 104 | ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);\n> > | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n> > /workdir/lib/vdso/gettimeofday.c: In function\n> > ‘__cvdso_clock_gettime_data.constprop’:\n> > /workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here\n> > 242 | u64 sec, ns;\n> > | ^~~\n>\n> The same pattern is used in some other do_ handlers, which do not generate this\n> warning. I also can't immediately see what is wrong.\n>\n> (...)\n>\n>\n> Thomas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=IFNgRYjw;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19928-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2a00:1450:4864:20::530\"","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=chromium.org","lists.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=IFNgRYjw;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=chromium.org\n (client-ip=2a00:1450:4864:20::530; 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Wed, 22 Apr 2026\n 00:00:24 -0700 (PDT)"],"X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","References":"\n \n <20260422071541-9a295128-d913-418f-a21c-1386fca30290@linutronix.de>","In-Reply-To":"\n <20260422071541-9a295128-d913-418f-a21c-1386fca30290@linutronix.de>","From":"Ricardo Ribalda ","Date":"Wed, 22 Apr 2026 15:00:11 +0800","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AQROBzBGVi8LEvYMOBvlvkNfmwMd-5JBUrvgcCu22OEXpA-bBMJrHFL2pdRz-k8","Message-ID":"\n ","Subject":"Re: New warning in linus/master","To":"=?utf-8?q?Thomas_Wei=C3=9Fschuh?= ","Cc":"linux-arm-kernel@lists.infradead.org,\n\tLinux Kernel Mailing List ,\n linuxppc-dev@lists.ozlabs.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680258,"web_url":"http://patchwork.ozlabs.org/comment/3680258/","msgid":"<5d16def3-3bad-49b1-866d-94a522e8d394@kernel.org>","date":"2026-04-22T07:26:02","subject":"Re: New warning in linus/master","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/people/92089/","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"content":"Le 22/04/2026 à 07:56, Thomas Weißschuh a écrit :\n> Hi Ricardo,\n> \n> On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n>> Media-CI has found a couple of new warnings in the latest kernel\n>> version for aarch64 and powerpc. They get fixed with this patch and\n>> before moving I wanted to know if this was under your radar.\n> \n> Thanks for the report. I was not aware of these so far.\n> \n>> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n>> index 7dec05dd33b7..65914842fae0 100644\n>> --- a/arch/arm64/kernel/vdso/Makefile\n>> +++ b/arch/arm64/kernel/vdso/Makefile\n>> @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n>> CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n>>\n>> ifneq ($(c-gettimeofday-y),)\n>> - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n>> + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n>> -Wno-maybe-uninitialized\n>> endif\n> \n> (...)\n> \n> I'd like to know exactly what is going on before suppressing the warning.\n> It is a non-standard warning, only enabled by *some* of the vDSO builds\n> for some reason.\n> \n>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Flinux-media%2Fusers%2Fribalda%2F-%2Fpipelines%2F1649144%2Ftest_report%3Fjob_name%3Dcross-gcc&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C5c0f15ee20a44072f47108dea0340304%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639124342424606113%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=9Tvp2aYfB02ijxVGLzCOYcMwZlPvqVDufxEporLl1mc%3D&reserved=0\n> \n> While I was able to download a configuration from this job and also use the\n> same container image, I can not reproduce the issue. Is the configuration the\n> full one or only the template?\n> \n> Could you provide full reproduction steps?\n> \n>> CONFIG_CC_VERSION_TEXT=\"aarch64-linux-gnu-gcc (Debian 15.2.0-16) 15.2.0\"\n> \n> The linked test log shows GCC 14.2, not 15.2.\n> Not that I could reproduce it with either one...\n> \n>> SYNC include/config/auto.conf\n>> CC arch/arm64/kernel/vdso/vgettimeofday.o\n>> In file included from :\n>> In function ‘vdso_set_timespec’,\n>> inlined from ‘do_aux’ at /workdir/lib/vdso/gettimeofday.c:266:2,\n>> inlined from ‘__cvdso_clock_gettime_common’ at\n>> /workdir/lib/vdso/gettimeofday.c:293:10,\n>> inlined from ‘__cvdso_clock_gettime_data.constprop’ at\n>> /workdir/lib/vdso/gettimeofday.c:306:7:\n>> /workdir/lib/vdso/gettimeofday.c:104:26: warning: ‘sec’ may be used\n>> uninitialized [-Wmaybe-uninitialized]\n>> 104 | ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);\n>> | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n>> /workdir/lib/vdso/gettimeofday.c: In function\n>> ‘__cvdso_clock_gettime_data.constprop’:\n>> /workdir/lib/vdso/gettimeofday.c:242:13: note: ‘sec’ was declared here\n>> 242 | u64 sec, ns;\n>> | ^~~\n> \n> The same pattern is used in some other do_ handlers, which do not generate this\n> warning. I also can't immediately see what is wrong.\n\nYou are likely in a special case where vdso_get_timestamp() returns \nfalse without setting &sec, and some versions of GCC and/or CLANG fail \nto see that vdso_set_timespec() is not called when vdso_get_timestamp() \nreturns false.\n\nChristophe","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=EzBqLzuO;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19931-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=172.105.4.254","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=EzBqLzuO;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org\n (client-ip=172.105.4.254; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680259,"web_url":"http://patchwork.ozlabs.org/comment/3680259/","msgid":"<20260422092713-4021a1a5-3a54-4260-878a-aec1bef3f8c7@linutronix.de>","date":"2026-04-22T07:32:06","subject":"Re: New warning in linus/master","submitter":{"id":87994,"url":"http://patchwork.ozlabs.org/api/people/87994/","name":"Thomas Weißschuh","email":"thomas.weissschuh@linutronix.de"},"content":"On Wed, Apr 22, 2026 at 03:00:11PM +0800, Ricardo Ribalda wrote:\n> On Wed, 22 Apr 2026 at 13:57, Thomas Weißschuh\n> wrote:\n> > On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n> > > Media-CI has found a couple of new warnings in the latest kernel\n> > > version for aarch64 and powerpc. They get fixed with this patch and\n> > > before moving I wanted to know if this was under your radar.\n> >\n> > Thanks for the report. I was not aware of these so far.\n> >\n> > > diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n> > > index 7dec05dd33b7..65914842fae0 100644\n> > > --- a/arch/arm64/kernel/vdso/Makefile\n> > > +++ b/arch/arm64/kernel/vdso/Makefile\n> > > @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n> > > CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n> > >\n> > > ifneq ($(c-gettimeofday-y),)\n> > > - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > -Wno-maybe-uninitialized\n> > > endif\n> >\n> > (...)\n> >\n> > I'd like to know exactly what is going on before suppressing the warning.\n> > It is a non-standard warning, only enabled by *some* of the vDSO builds\n> > for some reason.\n> >\n> > > https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc\n> >\n> > While I was able to download a configuration from this job and also use the\n> > same container image, I can not reproduce the issue. Is the configuration the\n> > full one or only the template?\n> >\n> > Could you provide full reproduction steps?\n> \n> You can try repro with:\n> \n> work/linux $ podman run -v .:/workdir/ --rm -it\n> registry.freedesktop.org/linux-media/media-ci/build:latest\n> $ cd /workdir\n> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> arch/arm64/kernel/vdso/vgettimeofday.o\n> \n> The gcc version discrepancy is because I the error was due to old gcc\n> version and I was playing around with that... but it fails in both\n> gcc14 and gcc15\n\nAck.\n\n> You can try with debian testing with\n> work/linux$ podman run -v .:/workdir/ --rm -it debian:testing\n> $ apt-get update\n> $ apt-get install gcc-aarch64-linux-gnu build-essential flex bison libssl-dev bc\n> $ cd /workdir\n> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> arch/arm64/kernel/vdso/vgettimeofday.o\n\nBoth reproducers do *not* reproduce the issue for me.\n(It is more or less exactly what I tried before)\n\nPlease note that this line does not work in general:\n$ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make arch/arm64/kernel/vdso/vgettimeofday.o\n\nThe vDSO object files can not be built in this way like regular kernel object\nfiles and will produce a compiler error, but not the one under discussion.\nInstead the vDSO on arm64 is built during the 'make prepare' phase.\n(Other architectures work differently, of course...)\n\n(...)\n\n\nThomas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256\n header.s=2020 header.b=HGuqX591;\n\tdkim=pass header.d=linutronix.de header.i=@linutronix.de\n header.a=ed25519-sha256 header.s=2020e header.b=vA6bVzJf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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charset=iso-8859-1","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"\n ","X-Spam-Status":"No, score=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680289,"web_url":"http://patchwork.ozlabs.org/comment/3680289/","msgid":"","date":"2026-04-22T08:06:45","subject":"Re: New warning in linus/master","submitter":{"id":80459,"url":"http://patchwork.ozlabs.org/api/people/80459/","name":"Ricardo Ribalda","email":"ribalda@chromium.org"},"content":"Hi Thomas\n\nOn Wed, 22 Apr 2026 at 15:32, Thomas Weißschuh\n wrote:\n>\n> On Wed, Apr 22, 2026 at 03:00:11PM +0800, Ricardo Ribalda wrote:\n> > On Wed, 22 Apr 2026 at 13:57, Thomas Weißschuh\n> > wrote:\n> > > On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n> > > > Media-CI has found a couple of new warnings in the latest kernel\n> > > > version for aarch64 and powerpc. They get fixed with this patch and\n> > > > before moving I wanted to know if this was under your radar.\n> > >\n> > > Thanks for the report. I was not aware of these so far.\n> > >\n> > > > diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n> > > > index 7dec05dd33b7..65914842fae0 100644\n> > > > --- a/arch/arm64/kernel/vdso/Makefile\n> > > > +++ b/arch/arm64/kernel/vdso/Makefile\n> > > > @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n> > > > CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n> > > >\n> > > > ifneq ($(c-gettimeofday-y),)\n> > > > - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > > + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > > -Wno-maybe-uninitialized\n> > > > endif\n> > >\n> > > (...)\n> > >\n> > > I'd like to know exactly what is going on before suppressing the warning.\n> > > It is a non-standard warning, only enabled by *some* of the vDSO builds\n> > > for some reason.\n> > >\n> > > > https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc\n> > >\n> > > While I was able to download a configuration from this job and also use the\n> > > same container image, I can not reproduce the issue. Is the configuration the\n> > > full one or only the template?\n> > >\n> > > Could you provide full reproduction steps?\n> >\n> > You can try repro with:\n> >\n> > work/linux $ podman run -v .:/workdir/ --rm -it\n> > registry.freedesktop.org/linux-media/media-ci/build:latest\n> > $ cd /workdir\n> > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> > arch/arm64/kernel/vdso/vgettimeofday.o\n> >\n> > The gcc version discrepancy is because I the error was due to old gcc\n> > version and I was playing around with that... but it fails in both\n> > gcc14 and gcc15\n>\n> Ack.\n>\n> > You can try with debian testing with\n> > work/linux$ podman run -v .:/workdir/ --rm -it debian:testing\n> > $ apt-get update\n> > $ apt-get install gcc-aarch64-linux-gnu build-essential flex bison libssl-dev bc\n> > $ cd /workdir\n> > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> > arch/arm64/kernel/vdso/vgettimeofday.o\n>\n> Both reproducers do *not* reproduce the issue for me.\n> (It is more or less exactly what I tried before)\n\n\nOk, I think I found what is going on. media-ci was forcing\nKCFLAGS=-Wmaybe-uninitialized\n\nhttps://gitlab.freedesktop.org/linux-media/media-ci/-/blob/main/test-build.sh?ref_type=heads#L29\n\nAnd something has changed in the kernel in the last version that\ntriggers a (hopefully) false positive.\n\ncan you try with:\n\nCROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\nKCFLAGS=-Wmaybe-uninitialized allyesconfig\nCROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\nKCFLAGS=-Wmaybe-uninitialized prepare\n\n?\n\n\n>\n> Please note that this line does not work in general:\n> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make arch/arm64/kernel/vdso/vgettimeofday.o\n>\n> The vDSO object files can not be built in this way like regular kernel object\n> files and will produce a compiler error, but not the one under discussion.\n> Instead the vDSO on arm64 is built during the 'make prepare' phase.\n> (Other architectures work differently, of course...)\n>\n> (...)\n>\n>\n> Thomas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=ICgTSCxi;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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Wed, 22 Apr 2026\n 01:06:59 -0700 (PDT)"],"X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","References":"\n \n <20260422071541-9a295128-d913-418f-a21c-1386fca30290@linutronix.de>\n \n <20260422092713-4021a1a5-3a54-4260-878a-aec1bef3f8c7@linutronix.de>","In-Reply-To":"\n <20260422092713-4021a1a5-3a54-4260-878a-aec1bef3f8c7@linutronix.de>","From":"Ricardo Ribalda ","Date":"Wed, 22 Apr 2026 16:06:45 +0800","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AQROBzA7vfrwO2plpLpwVGaJQHR2MKiQUcm7cyVmWYAcKsQQIyoUjhDJYfCBMLg","Message-ID":"\n ","Subject":"Re: New warning in linus/master","To":"=?utf-8?q?Thomas_Wei=C3=9Fschuh?= ","Cc":"linux-arm-kernel@lists.infradead.org,\n\tLinux Kernel Mailing List ,\n linuxppc-dev@lists.ozlabs.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680321,"web_url":"http://patchwork.ozlabs.org/comment/3680321/","msgid":"<20260422103218-1efdbb73-51fa-48c9-ae92-75306147d61f@linutronix.de>","date":"2026-04-22T08:45:21","subject":"Re: New warning in linus/master","submitter":{"id":87994,"url":"http://patchwork.ozlabs.org/api/people/87994/","name":"Thomas Weißschuh","email":"thomas.weissschuh@linutronix.de"},"content":"On Wed, Apr 22, 2026 at 04:06:45PM +0800, Ricardo Ribalda wrote:\n> On Wed, 22 Apr 2026 at 15:32, Thomas Weißschuh\n> wrote:\n> >\n> > On Wed, Apr 22, 2026 at 03:00:11PM +0800, Ricardo Ribalda wrote:\n> > > On Wed, 22 Apr 2026 at 13:57, Thomas Weißschuh\n> > > wrote:\n> > > > On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n> > > > > Media-CI has found a couple of new warnings in the latest kernel\n> > > > > version for aarch64 and powerpc. They get fixed with this patch and\n> > > > > before moving I wanted to know if this was under your radar.\n> > > >\n> > > > Thanks for the report. I was not aware of these so far.\n> > > >\n> > > > > diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n> > > > > index 7dec05dd33b7..65914842fae0 100644\n> > > > > --- a/arch/arm64/kernel/vdso/Makefile\n> > > > > +++ b/arch/arm64/kernel/vdso/Makefile\n> > > > > @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n> > > > > CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n> > > > >\n> > > > > ifneq ($(c-gettimeofday-y),)\n> > > > > - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > > > + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n> > > > > -Wno-maybe-uninitialized\n> > > > > endif\n> > > >\n> > > > (...)\n> > > >\n> > > > I'd like to know exactly what is going on before suppressing the warning.\n> > > > It is a non-standard warning, only enabled by *some* of the vDSO builds\n> > > > for some reason.\n> > > >\n> > > > > https://gitlab.freedesktop.org/linux-media/users/ribalda/-/pipelines/1649144/test_report?job_name=cross-gcc\n> > > >\n> > > > While I was able to download a configuration from this job and also use the\n> > > > same container image, I can not reproduce the issue. Is the configuration the\n> > > > full one or only the template?\n> > > >\n> > > > Could you provide full reproduction steps?\n> > >\n> > > You can try repro with:\n> > >\n> > > work/linux $ podman run -v .:/workdir/ --rm -it\n> > > registry.freedesktop.org/linux-media/media-ci/build:latest\n> > > $ cd /workdir\n> > > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> > > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> > > arch/arm64/kernel/vdso/vgettimeofday.o\n> > >\n> > > The gcc version discrepancy is because I the error was due to old gcc\n> > > version and I was playing around with that... but it fails in both\n> > > gcc14 and gcc15\n> >\n> > Ack.\n> >\n> > > You can try with debian testing with\n> > > work/linux$ podman run -v .:/workdir/ --rm -it debian:testing\n> > > $ apt-get update\n> > > $ apt-get install gcc-aarch64-linux-gnu build-essential flex bison libssl-dev bc\n> > > $ cd /workdir\n> > > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n> > > $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> > > arch/arm64/kernel/vdso/vgettimeofday.o\n> >\n> > Both reproducers do *not* reproduce the issue for me.\n> > (It is more or less exactly what I tried before)\n> \n> \n> Ok, I think I found what is going on. media-ci was forcing\n> KCFLAGS=-Wmaybe-uninitialized\n> \n> https://gitlab.freedesktop.org/linux-media/media-ci/-/blob/main/test-build.sh?ref_type=heads#L29\n> \n> And something has changed in the kernel in the last version that\n> triggers a (hopefully) false positive.\n> \n> can you try with:\n> \n> CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> KCFLAGS=-Wmaybe-uninitialized allyesconfig\n> CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n> KCFLAGS=-Wmaybe-uninitialized prepare\n\nThat works!\n\nThe warning was introduced in ed78b7b2c5ae (\"vdso/gettimeofday: Add a helper to\nread the sequence lock of a time namespace aware clock\").\n\nIt is *not* a false-positive, specifically:\n\ndo {\n\tif (vdso_read_begin_timens(vc, &seq)) {\n\t\tvd = __arch_get_vdso_u_timens_data(vd);\n\t\tvc = &vd->aux_clock_data[idx];\n\t\t/* Re-read from the real time data page */\n\t\tcontinue;\n\nThis 'continue' jumps to the end of the loop body and if the real vDSO datapage\nby chance has a sequence counter of '1' will exit the loop, leaving 'sec' and\n'nsec' uninitialized. My believe was that the 'continue' would jump to the\n*beginning* of the loop body, which is cleary wrong. Previously there was an\ninner while loop() which would make the 'continue' effectively start at the\nbeginning of the outer do-while loop.\n\n\t}\n\n\t/* Auxclock disabled? */\n\tif (vc->clock_mode == VDSO_CLOCKMODE_NONE)\n\t\treturn false;\n\n\tif (!vdso_get_timestamp(vd, vc, VDSO_BASE_AUX, &sec, &ns))\n\t\treturn false;\n\n} while (vdso_read_retry(vc, seq));\n\nvdso_set_timespec(ts, sec, ns);\n\n\nI'm working on a fix.\n\n\nThomas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256\n header.s=2020 header.b=MAD3is3O;\n\tdkim=pass header.d=linutronix.de header.i=@linutronix.de\n header.a=ed25519-sha256 header.s=2020e header.b=/Bhji4fI;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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t=1776847522;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=5nzzWLRM14gCMo68Gw80lFQtpEDbPKU5oX4IPo99Eck=;\n\tb=/Bhji4fIjCMF4t0dR952vgbdwty6z6aPQaHTJdOrpBjUy17nyVrWYVxSyPyGyzaKeRuBp9\n\tCZhbFmLv4gXeQLCg=="],"From":"Thomas =?utf-8?q?Wei=C3=9Fschuh?= ","To":"Ricardo Ribalda ","Cc":"linux-arm-kernel@lists.infradead.org,\n\tLinux Kernel Mailing List ,\n linuxppc-dev@lists.ozlabs.org","Subject":"Re: New warning in linus/master","Message-ID":"\n <20260422103218-1efdbb73-51fa-48c9-ae92-75306147d61f@linutronix.de>","References":"\n \n <20260422071541-9a295128-d913-418f-a21c-1386fca30290@linutronix.de>\n \n <20260422092713-4021a1a5-3a54-4260-878a-aec1bef3f8c7@linutronix.de>\n ","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=iso-8859-1","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"\n ","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3680359,"web_url":"http://patchwork.ozlabs.org/comment/3680359/","msgid":"","date":"2026-04-22T09:09:49","subject":"Re: New warning in linus/master","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/people/92089/","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"content":"Le 22/04/2026 à 10:45, Thomas Weißschuh a écrit :\n> On Wed, Apr 22, 2026 at 04:06:45PM +0800, Ricardo Ribalda wrote:\n>> On Wed, 22 Apr 2026 at 15:32, Thomas Weißschuh\n>> wrote:\n>>>\n>>> On Wed, Apr 22, 2026 at 03:00:11PM +0800, Ricardo Ribalda wrote:\n>>>> On Wed, 22 Apr 2026 at 13:57, Thomas Weißschuh\n>>>> wrote:\n>>>>> On Wed, Apr 22, 2026 at 11:51:45AM +0800, Ricardo Ribalda wrote:\n>>>>>> Media-CI has found a couple of new warnings in the latest kernel\n>>>>>> version for aarch64 and powerpc. They get fixed with this patch and\n>>>>>> before moving I wanted to know if this was under your radar.\n>>>>>\n>>>>> Thanks for the report. I was not aware of these so far.\n>>>>>\n>>>>>> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile\n>>>>>> index 7dec05dd33b7..65914842fae0 100644\n>>>>>> --- a/arch/arm64/kernel/vdso/Makefile\n>>>>>> +++ b/arch/arm64/kernel/vdso/Makefile\n>>>>>> @@ -50,7 +50,7 @@ CFLAGS_vgettimeofday.o = $(CC_FLAGS_ADD_VDSO)\n>>>>>> CFLAGS_vgetrandom.o = $(CC_FLAGS_ADD_VDSO)\n>>>>>>\n>>>>>> ifneq ($(c-gettimeofday-y),)\n>>>>>> - CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n>>>>>> + CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)\n>>>>>> -Wno-maybe-uninitialized\n>>>>>> endif\n>>>>>\n>>>>> (...)\n>>>>>\n>>>>> I'd like to know exactly what is going on before suppressing the warning.\n>>>>> It is a non-standard warning, only enabled by *some* of the vDSO builds\n>>>>> for some reason.\n>>>>>\n>>>>>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Flinux-media%2Fusers%2Fribalda%2F-%2Fpipelines%2F1649144%2Ftest_report%3Fjob_name%3Dcross-gcc&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C7cbf9009269d4ddc16d208dea04b86f1%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639124443421115079%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=O4r8HjaUn7KEgW8tDE9GEC9e8CWyJBpCfhVTJZZ%2BFHs%3D&reserved=0\n>>>>>\n>>>>> While I was able to download a configuration from this job and also use the\n>>>>> same container image, I can not reproduce the issue. Is the configuration the\n>>>>> full one or only the template?\n>>>>>\n>>>>> Could you provide full reproduction steps?\n>>>>\n>>>> You can try repro with:\n>>>>\n>>>> work/linux $ podman run -v .:/workdir/ --rm -it\n>>>> registry.freedesktop.org/linux-media/media-ci/build:latest\n>>>> $ cd /workdir\n>>>> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n>>>> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n>>>> arch/arm64/kernel/vdso/vgettimeofday.o\n>>>>\n>>>> The gcc version discrepancy is because I the error was due to old gcc\n>>>> version and I was playing around with that... but it fails in both\n>>>> gcc14 and gcc15\n>>>\n>>> Ack.\n>>>\n>>>> You can try with debian testing with\n>>>> work/linux$ podman run -v .:/workdir/ --rm -it debian:testing\n>>>> $ apt-get update\n>>>> $ apt-get install gcc-aarch64-linux-gnu build-essential flex bison libssl-dev bc\n>>>> $ cd /workdir\n>>>> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make allyesconfig\n>>>> $ CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n>>>> arch/arm64/kernel/vdso/vgettimeofday.o\n>>>\n>>> Both reproducers do *not* reproduce the issue for me.\n>>> (It is more or less exactly what I tried before)\n>>\n>>\n>> Ok, I think I found what is going on. media-ci was forcing\n>> KCFLAGS=-Wmaybe-uninitialized\n>>\n>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Flinux-media%2Fmedia-ci%2F-%2Fblob%2Fmain%2Ftest-build.sh%3Fref_type%3Dheads%23L29&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C7cbf9009269d4ddc16d208dea04b86f1%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639124443421146576%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2FpTHYfCn5ob42%2Fm6FVOZ32PVzuXBNBT3rlMVWslCfhw%3D&reserved=0\n>>\n>> And something has changed in the kernel in the last version that\n>> triggers a (hopefully) false positive.\n>>\n>> can you try with:\n>>\n>> CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n>> KCFLAGS=-Wmaybe-uninitialized allyesconfig\n>> CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 make\n>> KCFLAGS=-Wmaybe-uninitialized prepare\n> \n> That works!\n> \n> The warning was introduced in ed78b7b2c5ae (\"vdso/gettimeofday: Add a helper to\n> read the sequence lock of a time namespace aware clock\").\n> \n> It is *not* a false-positive, specifically:\n> \n> do {\n> \tif (vdso_read_begin_timens(vc, &seq)) {\n> \t\tvd = __arch_get_vdso_u_timens_data(vd);\n> \t\tvc = &vd->aux_clock_data[idx];\n> \t\t/* Re-read from the real time data page */\n> \t\tcontinue;\n> \n> This 'continue' jumps to the end of the loop body and if the real vDSO datapage\n> by chance has a sequence counter of '1' will exit the loop, leaving 'sec' and\n> 'nsec' uninitialized. My believe was that the 'continue' would jump to the\n> *beginning* of the loop body, which is cleary wrong. Previously there was an\n> inner while loop() which would make the 'continue' effectively start at the\n> beginning of the outer do-while loop.\n\nWell spotted. I missed it too while reviewing.\n\nA 'retry:' label at the begining of the loop with a 'goto retry' instead \nof the 'continue' should make it.\n\nChristophe\n\n> \n> \t}\n> \n> \t/* Auxclock disabled? */\n> \tif (vc->clock_mode == VDSO_CLOCKMODE_NONE)\n> \t\treturn false;\n> \n> \tif (!vdso_get_timestamp(vd, vc, VDSO_BASE_AUX, &sec, &ns))\n> \t\treturn false;\n> \n> } while (vdso_read_retry(vc, seq));\n> \n> vdso_set_timespec(ts, sec, ns);\n> \n> \n> I'm working on a fix.\n> \n> \n> Thomas\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=bW4Len4g;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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