[{"id":3677552,"web_url":"http://patchwork.ozlabs.org/comment/3677552/","msgid":"<20260415092428.3884-1-linuxtestproject.agent@gmail.com>","list_archive_url":null,"date":"2026-04-15T09:24:28","subject":"Re: [LTP] userfaultfd: Use two-step handshake to probe features","submitter":{"id":93132,"url":"http://patchwork.ozlabs.org/api/people/93132/","name":null,"email":"linuxtestproject.agent@gmail.com"},"content":"Hi Ricardo,\n\nOn Wed, 15 Apr 2026 10:06:15 +0200, Ricardo Branco wrote:\n> userfaultfd: Use two-step handshake to probe features\n\nReviewed-by: LTP AI Reviewer \n\n---\nNote:\n\nOur agent completed the review of the patch. The full review can be\nfound at: https://patchwork.ozlabs.org/project/ltp/list/?series=499941\n\nThe agent can sometimes produce false positives although often its\nfindings are genuine. If you find issues with the review, please\ncomment this email or ignore the suggestions.","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=a1za7ev2;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; helo=picard.linux.it;\n envelope-from=ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it;\n receiver=patchwork.ozlabs.org)"],"Received":["from picard.linux.it (picard.linux.it [IPv6:2001:1418:10:5::2])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fwbM93xkPz1yCv\n\tfor ; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3685885,"web_url":"http://patchwork.ozlabs.org/comment/3685885/","msgid":"","list_archive_url":null,"date":"2026-05-04T15:50:12","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":8530,"url":"http://patchwork.ozlabs.org/api/people/8530/","name":"Cyril Hrubis","email":"chrubis@suse.cz"},"content":"Hi!\n> +\t/*\n> +\t * Two-step handshake to check if feature is available\n> +\t */\n\nPlease no obvious comments like this.\n\n> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n> +\tuffdio_api.api = UFFD_API;\n> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n> +\tif (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))\n> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_PAGEFAULT_FLAG_WP not supported\");\n> +\tSAFE_CLOSE(uffd);\n\nI do not get why are we adding this code when we do the same just a few\nlines below. Shouldn't just this suffice?\n\ndiff --git a/testcases/kernel/syscalls/userfaultfd/userfaultfd05.c b/testcases/kernel/syscalls/userfaultfd/userfaultfd05.c\nindex e25a227cf..b19132d0c 100644\n--- a/testcases/kernel/syscalls/userfaultfd/userfaultfd05.c\n+++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd05.c\n@@ -95,6 +95,9 @@ static void run(void)\n \n SAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n \n+ if (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))\n+ tst_brk(TCONF, \"UFFD_FEATURE_PAGEFAULT_FLAG_WP not supported\");\n+\n uffdio_register.range.start = (unsigned long) page;\n uffdio_register.range.len = page_size;\n uffdio_register.mode = UFFDIO_REGISTER_MODE_WP;\n\n\n> index 5b1252c35..e1b3c2f6f 100644\n> --- a/testcases/kernel/syscalls/userfaultfd/userfaultfd06.c\n> +++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd06.c\n> @@ -97,18 +97,25 @@ static void run(void)\n> \n> \tpoison_fault_seen = 0;\n> \tsigbus_seen = 0;\n> -\tset_pages();\n> \n> +\t/*\n> +\t * Two-step handshake to check if feature is available\n> +\t */\n> \tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n> +\tuffdio_api.api = UFFD_API;\n> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n> +\tif (!(uffdio_api.features & UFFD_FEATURE_POISON))\n> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_POISON not supported\");\n> +\tSAFE_CLOSE(uffd);\n> \n> +\tset_pages();\n> +\n> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n> \tuffdio_api.api = UFFD_API;\n> \tuffdio_api.features = UFFD_FEATURE_POISON;\n>\n> \tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n> \n> -\tif (!(uffdio_api.features & UFFD_FEATURE_POISON))\n> -\t\ttst_brk(TCONF, \"UFFD_FEATURE_POISON not supported\");\n> -\n\nThis does not seem to make any sense. The code already checks for the\nfeature, or do I miss something?\n\n> \tuffdio_register.range.start = (unsigned long) page;\n> \tuffdio_register.range.len = page_size;\n> \tuffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;\n> -- \n> 2.53.0\n> \n> \n> -- \n> Mailing list info: https://lists.linux.it/listinfo/ltp","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=c2UAqZcj;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.cz\n header.i=@suse.cz header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=55UDT3/G;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256 header.s=susede2_rsa\n header.b=c2UAqZcj;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=55UDT3/G;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3685892,"web_url":"http://patchwork.ozlabs.org/comment/3685892/","msgid":"","list_archive_url":null,"date":"2026-05-04T15:59:44","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":92484,"url":"http://patchwork.ozlabs.org/api/people/92484/","name":"Ricardo Branco","email":"rbranco@suse.de"},"content":"On 5/4/26 5:50 PM, Cyril Hrubis wrote:\n>> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n>> +\tuffdio_api.api = UFFD_API;\n>> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n>> +\tif (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))\n>> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_PAGEFAULT_FLAG_WP not supported\");\n>> +\tSAFE_CLOSE(uffd);\n> I do not get why are we adding this code when we do the same just a few\n> lines below. Shouldn't just this suffice?\n\nThat's why the comment is needed because it isn't obvious.\n\nWe need to do the 2 step handshake, first with uffdio_api.features set \nto zero,\nthen again with the desired features.\n\n>> index 5b1252c35..e1b3c2f6f 100644\n>> --- a/testcases/kernel/syscalls/userfaultfd/userfaultfd06.c\n>> +++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd06.c\n>> @@ -97,18 +97,25 @@ static void run(void)\n>> \n>> \tpoison_fault_seen = 0;\n>> \tsigbus_seen = 0;\n>> -\tset_pages();\n>> \n>> +\t/*\n>> +\t * Two-step handshake to check if feature is available\n>> +\t */\n>> \tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n>> +\tuffdio_api.api = UFFD_API;\n>> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n>> +\tif (!(uffdio_api.features & UFFD_FEATURE_POISON))\n>> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_POISON not supported\");\n>> +\tSAFE_CLOSE(uffd);\n>> \n>> +\tset_pages();\n>> +\n>> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n>> \tuffdio_api.api = UFFD_API;\n>> \tuffdio_api.features = UFFD_FEATURE_POISON;\n>>\n>> \tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n>> \n>> -\tif (!(uffdio_api.features & UFFD_FEATURE_POISON))\n>> -\t\ttst_brk(TCONF, \"UFFD_FEATURE_POISON not supported\");\n>> -\n> This does not seem to make any sense. The code already checks for the\n> feature, or do I miss something?\n\nContext: https://github.com/linux-test-project/ltp/issues/1289","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=05hGymPq;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.de\n header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=1mI0iV0Q;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa\n header.b=05hGymPq;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=1mI0iV0Q;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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ARC_NA(0.00)[];\n MID_RHS_MATCH_FROM(0.00)[]; RCPT_COUNT_TWO(0.00)[2];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[];\n FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[];\n RCVD_COUNT_TWO(0.00)[2];\n DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid]","X-Spam-Level":"","X-Spam-Status":"No, score=0.1 required=7.0 tests=DKIM_SIGNED,DKIM_VALID,\n DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS shortcircuit=no\n autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on in-6.smtp.seeweb.it","X-Virus-Scanned":"clamav-milter 1.0.9 at in-6.smtp.seeweb.it","X-Virus-Status":"Clean","Subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","X-BeenThere":"ltp@lists.linux.it","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"Linux Test Project ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Cc":"ltp@lists.linux.it","Content-Transfer-Encoding":"7bit","Content-Type":"text/plain; charset=\"us-ascii\"; Format=\"flowed\"","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3685943,"web_url":"http://patchwork.ozlabs.org/comment/3685943/","msgid":"","list_archive_url":null,"date":"2026-05-04T17:48:19","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":8530,"url":"http://patchwork.ozlabs.org/api/people/8530/","name":"Cyril Hrubis","email":"chrubis@suse.cz"},"content":"Hi!\n> >> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n> >> +\tuffdio_api.api = UFFD_API;\n> >> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n> >> +\tif (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))\n> >> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_PAGEFAULT_FLAG_WP not supported\");\n> >> +\tSAFE_CLOSE(uffd);\n> > I do not get why are we adding this code when we do the same just a few\n> > lines below. Shouldn't just this suffice?\n> \n> That's why the comment is needed because it isn't obvious.\n> \n> We need to do the 2 step handshake, first with uffdio_api.features set \n> to zero, then again with the desired features.\n\nThe obviously the comment is not useful because it does not explain\nanything :-).\n\nLooking at the kernel code, it seems to set the output flags\nuncoditionally so we can use that.\n\nOr check for EINVAL when we pass unsupported flags.\n\nHowever I would put this code into a common header and call it only in\nthe test setup (so that it's not executed on each test iteration).\n\n#define CHECK_UFFD_FLAG(flag) do { \\\n ... \\\n\tif (!(uffdio_api.features & (flag))) \\\n\t\ttst_brk(TCONF, #flag \" not supported\"); \\\n\t... \\\n} while (0)","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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Mon, 4 May 2026 19:48:22 +0200 (CEST)","from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org\n [IPv6:2a07:de40:b281:104:10:150:64:97])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest\n SHA256)\n (No client certificate requested)\n by smtp-out1.suse.de (Postfix) with ESMTPS id AC61C6B46B;\n Mon, 4 May 2026 17:48:21 +0000 (UTC)","from imap1.dmz-prg2.suse.org (localhost [127.0.0.1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest\n SHA256)\n (No client certificate requested)\n by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 98882593A3;\n Mon, 4 May 2026 17:48:21 +0000 (UTC)","from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167])\n by imap1.dmz-prg2.suse.org with ESMTPSA id TsLuI+Xb+Gl7IwAAD6G6ig\n (envelope-from ); Mon, 04 May 2026 17:48:21 +0000"],"Date":"Mon, 4 May 2026 19:48:19 +0200","From":"Cyril Hrubis ","To":"Ricardo Branco ","Message-ID":"","References":"<20260411092452.211540-1-rbranco@suse.de>\n <20260415080623.164440-1-rbranco@suse.de>\n \n ","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"","X-Rspamd-Pre-Result":["action=no action; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3686360,"web_url":"http://patchwork.ozlabs.org/comment/3686360/","msgid":"","list_archive_url":null,"date":"2026-05-05T11:27:23","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":92484,"url":"http://patchwork.ozlabs.org/api/people/92484/","name":"Ricardo Branco","email":"rbranco@suse.de"},"content":"On 5/4/26 7:48 PM, Cyril Hrubis wrote:\n> Hi!\n>>>> +\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, false);\n>>>> +\tuffdio_api.api = UFFD_API;\n>>>> +\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n>>>> +\tif (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))\n>>>> +\t\ttst_brk(TCONF, \"UFFD_FEATURE_PAGEFAULT_FLAG_WP not supported\");\n>>>> +\tSAFE_CLOSE(uffd);\n>>> I do not get why are we adding this code when we do the same just a few\n>>> lines below. Shouldn't just this suffice?\n>> That's why the comment is needed because it isn't obvious.\n>>\n>> We need to do the 2 step handshake, first with uffdio_api.features set\n>> to zero, then again with the desired features.\n> The obviously the comment is not useful because it does not explain\n> anything :-).\n>\n> Looking at the kernel code, it seems to set the output flags\n> uncoditionally so we can use that.\n>\n> Or check for EINVAL when we pass unsupported flags.\n>\n> However I would put this code into a common header and call it only in\n> the test setup (so that it's not executed on each test iteration).\n>\n> #define CHECK_UFFD_FLAG(flag) do { \\\n> ... \\\n> \tif (!(uffdio_api.features & (flag))) \\\n> \t\ttst_brk(TCONF, #flag \" not supported\"); \\\n> \t... \\\n> } while (0)\n>\n\nWill add this macro.  Let's keep doing the 2 step handshake though.","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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module=replies;\n Message is reply to one we originated","action=no action; module=replies;\n Message is reply to one we originated"],"X-Spamd-Result":"default: False [-4.00 / 50.00];\n\tREPLY(-4.00)[]","X-Rspamd-Queue-Id":"208D86AD6E","X-Spam-Score":"-4.00","X-Rspamd-Server":"rspamd2.dmz-prg2.suse.org","X-Rspamd-Action":"no action","X-Spam-Level":"","X-Spam-Status":"No, score=0.0 required=7.0 tests=SPF_HELO_NONE,SPF_PASS\n shortcircuit=no autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on in-5.smtp.seeweb.it","X-Virus-Scanned":"clamav-milter 1.0.9 at in-5.smtp.seeweb.it","X-Virus-Status":"Clean","Subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","X-BeenThere":"ltp@lists.linux.it","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"Linux Test Project ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Cc":"ltp@lists.linux.it","Content-Transfer-Encoding":"base64","Content-Type":"text/plain; charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3686375,"web_url":"http://patchwork.ozlabs.org/comment/3686375/","msgid":"","list_archive_url":null,"date":"2026-05-05T12:07:09","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":8530,"url":"http://patchwork.ozlabs.org/api/people/8530/","name":"Cyril Hrubis","email":"chrubis@suse.cz"},"content":"Hi!\n> > However I would put this code into a common header and call it only in\n> > the test setup (so that it's not executed on each test iteration).\n> >\n> > #define CHECK_UFFD_FLAG(flag) do { \\\n> > ... \\\n> > \tif (!(uffdio_api.features & (flag))) \\\n> > \t\ttst_brk(TCONF, #flag \" not supported\"); \\\n> > \t... \\\n> > } while (0)\n> >\n> \n> Will add this macro.  Let's keep doing the 2 step handshake though.\n\nSure, sounds good to me.","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=ezlNPPk6;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.cz\n header.i=@suse.cz header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=g2tQRKeV;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256 header.s=susede2_rsa\n header.b=ezlNPPk6;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=g2tQRKeV;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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charset=\"iso-8859-1\"","Content-Transfer-Encoding":"quoted-printable","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3687599,"web_url":"http://patchwork.ozlabs.org/comment/3687599/","msgid":"<47b59750-b00c-4f04-956b-38d1695e2ffa@suse.de>","list_archive_url":null,"date":"2026-05-07T08:32:34","subject":"Re: [LTP] [PATCH v2] userfaultfd: Use two-step handshake to probe\n features","submitter":{"id":92484,"url":"http://patchwork.ozlabs.org/api/people/92484/","name":"Ricardo Branco","email":"rbranco@suse.de"},"content":"On 5/5/26 2:07 PM, Cyril Hrubis wrote:\n> Hi!\n>>> However I would put this code into a common header and call it only in\n>>> the test setup (so that it's not executed on each test iteration).\n>>>\n>>> #define CHECK_UFFD_FLAG(flag) do { \\\n>>> ... \\\n>>> \tif (!(uffdio_api.features & (flag))) \\\n>>> \t\ttst_brk(TCONF, #flag \" not supported\"); \\\n>>> \t... \\\n>>> } while (0)\n>>>\n>> Will add this macro.  Let's keep doing the 2 step handshake though.\n> Sure, sounds good to me.\n>\nJust did it in a 2-part v3.\n\nCheers,\nR","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=eQoE5mU3;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.de\n header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=OLdGL+AD;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa\n header.b=eQoE5mU3;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=OLdGL+AD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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