[{"id":3675892,"web_url":"http://patchwork.ozlabs.org/comment/3675892/","msgid":"<9db9515b-08e8-47bd-aced-206ac183195a@linux.intel.com>","list_archive_url":null,"date":"2026-04-10T13:45:43","subject":"Re: [patch 09/38] iommu/vt-d: Use sched_clock() instead of\n get_cycles()","submitter":{"id":73538,"url":"http://patchwork.ozlabs.org/api/people/73538/","name":"Baolu Lu","email":"baolu.lu@linux.intel.com"},"content":"On 4/10/2026 8:19 PM, Thomas Gleixner wrote:\n> Calculating the timeout from get_cycles() is a historical leftover without\n> any functional requirement.\n> \n> Use ktime_get() instead.\n\nThe subject line says \"Use sched_clock() ...\", but the implementation\nactually uses ktime_get(). Is it a typo or anything I misunderstood?\n\nOther parts look good to me,\n\nReviewed-by: Lu Baolu \n\n> \n> Signed-off-by: Thomas Gleixner\n> Cc:x86@kernel.org\n> Cc: Lu Baolu\n> Cc:iommu@lists.linux.dev\n> ---\n> arch/x86/include/asm/iommu.h | 3 ---\n> drivers/iommu/intel/dmar.c | 4 ++--\n> drivers/iommu/intel/iommu.h | 8 ++++++--\n> 3 files changed, 8 insertions(+), 7 deletions(-)\n\nThanks,\nbaolu","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","sparclinux@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=YJ3HbNt9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; helo=mail.ozlabs.org;\n envelope-from=srs0=v9sr=cj=vger.kernel.org=sparclinux+bounces-6688-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=172.234.253.10 arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.intel.com","gandalf.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=YJ3HbNt9;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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arc=none smtp.client-ip=192.198.163.10"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1775828758; x=1807364758;\n h=message-id:date:mime-version:cc:subject:to:references:\n from:in-reply-to:content-transfer-encoding;\n bh=XhwVNk7AmxnQFYYbofWW0xn2GGcCMLifpnTZm0hI0iw=;\n b=YJ3HbNt9KqVB6c72n0p3I8tV+eLDZ8Pyvh5wkY5xQ80nLKZnDJVlBLVF\n /hWAQZuWIDsV0WzZ3NafaV6PbRU1gbqE03bRNkaV148sKfbtEAW/igX0F\n p3HosWplFkRdknQELLo40Q+VWWm6s0SkUOr9cB6gj0v7QrMlkl8j1EP6B\n QEPe32p1VrBic6WVONIBTy+AhKGOcgJLSEVoXNFsHqpkeFVJRhKHh4Gpb\n EprtxrG4CNlyH98+XlztwbJRkUni6GBzIuFoWPlIOvUPOQzONN1aV4owx\n gK5Jt8h5EaRkh/0/onvfP49+HmHEo3oJPFp2j6q9ni6hd9s9zFXoDX4P+\n Q==;","X-CSE-ConnectionGUID":["W3a5tcAAR4SmhhFO5OGbew==","5EGNTPxSQP+GmiqHTb7hcA=="],"X-CSE-MsgGUID":["NE2Q/sTERymqCkH53yD8ig==","poU0WXXBR3aVBOf3UOJDiA=="],"X-IronPort-AV":["E=McAfee;i=\"6800,10657,11755\"; a=\"88229167\"","E=Sophos;i=\"6.23,171,1770624000\";\n d=\"scan'208\";a=\"88229167\"","E=Sophos;i=\"6.23,171,1770624000\";\n d=\"scan'208\";a=\"225932507\""],"X-ExtLoop1":"1","Message-ID":"<9db9515b-08e8-47bd-aced-206ac183195a@linux.intel.com>","Date":"Fri, 10 Apr 2026 21:45:43 +0800","Precedence":"bulk","X-Mailing-List":"sparclinux@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Cc":"baolu.lu@linux.intel.com, x86@kernel.org, iommu@lists.linux.dev,\n Arnd Bergmann , Michael Grzeschik\n , netdev@vger.kernel.org,\n linux-wireless@vger.kernel.org, Herbert Xu ,\n linux-crypto@vger.kernel.org, Vlastimil Babka ,\n linux-mm@kvack.org, David Woodhouse ,\n Bernie Thompson , linux-fbdev@vger.kernel.org,\n Theodore Tso , linux-ext4@vger.kernel.org,\n Andrew Morton ,\n Uladzislau Rezki , Marco Elver ,\n Dmitry Vyukov , kasan-dev@googlegroups.com,\n Andrey Ryabinin ,\n Thomas Sailer , linux-hams@vger.kernel.org,\n \"Jason A. Donenfeld\" ,\n Richard Henderson ,\n linux-alpha@vger.kernel.org, Russell King ,\n linux-arm-kernel@lists.infradead.org,\n Catalin Marinas ,\n Huacai Chen , loongarch@lists.linux.dev,\n Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen , Jonas Bonn ,\n linux-openrisc@vger.kernel.org, Helge Deller ,\n linux-parisc@vger.kernel.org, Michael Ellerman ,\n linuxppc-dev@lists.ozlabs.org, Paul Walmsley ,\n linux-riscv@lists.infradead.org, Heiko Carstens ,\n linux-s390@vger.kernel.org, \"David S. Miller\" ,\n sparclinux@vger.kernel.org","Subject":"Re: [patch 09/38] iommu/vt-d: Use sched_clock() instead of\n get_cycles()","To":"Thomas Gleixner , LKML ","References":"<20260410120044.031381086@kernel.org>\n <20260410120318.187521447@kernel.org>","Content-Language":"en-US","From":"Baolu Lu ","In-Reply-To":"<20260410120318.187521447@kernel.org>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-Spam-Status":"No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DMARC_PASS,\n\tHEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3675935,"web_url":"http://patchwork.ozlabs.org/comment/3675935/","msgid":"<87y0iuzw3r.ffs@tglx>","list_archive_url":null,"date":"2026-04-10T15:14:00","subject":"Re: [patch 09/38] iommu/vt-d: Use sched_clock() instead of\n get_cycles()","submitter":{"id":92397,"url":"http://patchwork.ozlabs.org/api/people/92397/","name":"Thomas Gleixner","email":"tglx@kernel.org"},"content":"On Fri, Apr 10 2026 at 21:45, Baolu Lu wrote:\n> On 4/10/2026 8:19 PM, Thomas Gleixner wrote:\n>> Calculating the timeout from get_cycles() is a historical leftover without\n>> any functional requirement.\n>> \n>> Use ktime_get() instead.\n>\n> The subject line says \"Use sched_clock() ...\", but the implementation\n> actually uses ktime_get(). Is it a typo or anything I misunderstood?\n\nIndeed. Leftover from an earlier version.\n\nThanks,\n\n tglx","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","sparclinux@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@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=DQRfv3hP;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; helo=mail.ozlabs.org;\n envelope-from=srs0=o8pz=cj=vger.kernel.org=sparclinux+bounces-6689-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=172.105.105.114 arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org","gandalf.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=DQRfv3hP;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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Miller\"\n , sparclinux@vger.kernel.org","Subject":"Re: [patch 09/38] iommu/vt-d: Use sched_clock() instead of\n get_cycles()","In-Reply-To":"<9db9515b-08e8-47bd-aced-206ac183195a@linux.intel.com>","References":"<20260410120044.031381086@kernel.org>\n <20260410120318.187521447@kernel.org>\n <9db9515b-08e8-47bd-aced-206ac183195a@linux.intel.com>","Date":"Fri, 10 Apr 2026 17:14:00 +0200","Message-ID":"<87y0iuzw3r.ffs@tglx>","Precedence":"bulk","X-Mailing-List":"sparclinux@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}}]