From nobody Thu Apr 16 03:40:00 2026 Received: from m16.mail.126.com (m16.mail.126.com [220.197.31.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80A923845BB; Tue, 3 Mar 2026 07:24:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772522674; cv=none; b=hdOYvAawUJkBAq2OfmBeL6MqWR+Fxrdvv2l7s5vkV5JxxEFUuaQJ9uDNQgMM8qcoh7SsB82pw2rOQfFnGoMAuN/H2w0ioeJQoAa35IMnCWdIb7CIgfbsQNCAIcC1s/VuqTKATxhm6j/UAuJDfvuZAAAJaN2xl8wPn69bHmqkR9A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772522674; c=relaxed/simple; bh=VGYfChW+hftxyiHbvyTWUAIFNt4cxQtpYaguIbM90pg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U0e4lCqxGyIDZwoIFZbMe9gwrefX4/aZSRiy4RKbQsmDDTFSu/uX7dHa4jIwjQnYZ6pM3JGpCKsjp62UhS4a5t811hO6eSH7v9pfSZqroSxkwVDsYKUKF34u33DkQiQ/OVD5UwVdVzs4Ew5cZuQ6/r9N0tZyIEE++d3IJphqxhE= ARC-Authentication-Results: i=1; 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Tue, 03 Mar 2026 15:23:39 +0800 (CST) From: Zhao Mengmeng To: tj@kernel.org, void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, shuah@kernel.org, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev, zhaomengmeng@kylinos.cn Subject: [PATCH 1/3] tools/sched_ext: Add -fms-extensions to bpf build flags Date: Tue, 3 Mar 2026 15:23:15 +0800 Message-ID: <20260303072317.76035-2-zhaomzhao@126.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260303072317.76035-1-zhaomzhao@126.com> References: <20260303072317.76035-1-zhaomzhao@126.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: QCkvCgDnT3h6jKZpVDeAAw--.53445S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7Cr18Kr1DGw1fuw4DKrykKrg_yoW8Xr17pa 9I9rW8GF47tFy8Gws7JFW3trWY9ws2gw40qryqqwn0yF97t3ZFq3s7tF43Ar17tw4kCry7 ua4xKasxWw12v3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07UE4E_UUUUU= X-CM-SenderInfo: 52kd0zp2kd0qqrswhudrp/xtbBqxtFvGmmjHtQHwAA3+ Content-Type: text/plain; charset="utf-8" From: Zhao Mengmeng Similar to commit 835a50753579 ("selftests/bpf: Add -fms-extensions to bpf build flags") and commit 639f58a0f480 ("bpftool: Fix build warnings due to MS extensions") The kernel is now built with -fms-extensions, therefore generated vmlinux.h contains types like: struct aes_key { struct aes_enckey; union aes_invkey_arch inv_k; }; struct ns_common { ... union { struct ns_tree; struct callback_head ns_rcu; }; }; Which raise warning like below when building scx scheduler: tools/sched_ext/build/include/vmlinux.h:50533:3: warning: declaration does not declare anything [-Wmissing-declarations] 50533 | struct ns_tree; | ^ Fix it by using -fms-extensions and -Wno-microsoft-anon-tag flags to build bpf programs that #include "vmlinux.h" Signed-off-by: Zhao Mengmeng Reviewed-by: Andrea Righi --- tools/sched_ext/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/sched_ext/Makefile b/tools/sched_ext/Makefile index 47ad7444677e..21554f089692 100644 --- a/tools/sched_ext/Makefile +++ b/tools/sched_ext/Makefile @@ -122,6 +122,8 @@ BPF_CFLAGS =3D -g -D__TARGET_ARCH_$(SRCARCH) \ -I../../include \ $(call get_sys_includes,$(CLANG)) \ -Wall -Wno-compare-distinct-pointer-types \ + -Wno-microsoft-anon-tag \ + -fms-extensions \ -O2 -mcpu=3Dv3 =20 # sort removes libbpf duplicates when not cross-building --=20 2.43.0 From nobody Thu Apr 16 03:40:00 2026 Received: from m16.mail.126.com (m16.mail.126.com [117.135.210.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7DA552848BB; 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charset="utf-8" From: Zhao Mengmeng Similar to commit 835a50753579 ("selftests/bpf: Add -fms-extensions to bpf build flags") and commit 639f58a0f480 ("bpftool: Fix build warnings due to MS extensions") Fix "declaration does not declare anything" warning by using -fms-extensions and -Wno-microsoft-anon-tag flags to build bpf programs that #include "vmlinux.h" Signed-off-by: Zhao Mengmeng Reviewed-by: Andrea Righi --- tools/testing/selftests/sched_ext/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/sel= ftests/sched_ext/Makefile index 2815a875bde2..a3bbe2c7911b 100644 --- a/tools/testing/selftests/sched_ext/Makefile +++ b/tools/testing/selftests/sched_ext/Makefile @@ -93,6 +93,8 @@ BPF_CFLAGS =3D -g -D__TARGET_ARCH_$(SRCARCH) \ $(CLANG_SYS_INCLUDES) \ -Wall -Wno-compare-distinct-pointer-types \ -Wno-incompatible-function-pointer-types \ + -Wno-microsoft-anon-tag \ + -fms-extensions \ -O2 -mcpu=3Dv3 =20 # sort removes libbpf duplicates when not cross-building --=20 2.43.0 From nobody Thu Apr 16 03:40:00 2026 Received: from m16.mail.126.com (m16.mail.126.com [220.197.31.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2D11D38654A; 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arc=none smtp.client-ip=220.197.31.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=126.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b="hh4xzTVt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=Tv d5JbamKTm8eCSpeOkJ/IJ6Kk9pcl+E2+ZvdRrW8Hs=; b=hh4xzTVtGQy3DtAnGS rX5TzapAZkthb9vqe32BwpoB64jhwifvvttOmRphwWjYO4R004czdL+haMg1S107 NDQ5ta9bwjkW2NWhtd2AR/CYIHSldeQEIHPDrHDFT3Ua5jwE13V7FiaoZ+S5IUM7 VemTwn4bWo/oej0d0b4zOsfpo= Received: from localhost.localdomain (unknown []) by gzsmtp5 (Coremail) with SMTP id QCkvCgDnT3h6jKZpVDeAAw--.53445S5; Tue, 03 Mar 2026 15:23:41 +0800 (CST) From: Zhao Mengmeng To: tj@kernel.org, void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, shuah@kernel.org, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev, zhaomengmeng@kylinos.cn Subject: [PATCH 3/3] selftests/sched_ext: Fix peek_dsq.bpf.c compile error for clang 17 Date: Tue, 3 Mar 2026 15:23:17 +0800 Message-ID: <20260303072317.76035-4-zhaomzhao@126.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260303072317.76035-1-zhaomzhao@126.com> References: <20260303072317.76035-1-zhaomzhao@126.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: QCkvCgDnT3h6jKZpVDeAAw--.53445S5 X-Coremail-Antispam: 1Uf129KBjvJXoW7Ww4fGFyxuFW7XFW3tw45GFg_yoW8Xw13pa 18ZF1rAr4ftF43G3W8JrWkJrWUXrsavF4Iga13ZrZFqFWrJw48Jr1xKFW3tryDWr97uFs3 Aa4Skw1YkFWDJFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07j5wIDUUUUU= X-CM-SenderInfo: 52kd0zp2kd0qqrswhudrp/xtbBlx1GvWmmjH2t0wAA3x Content-Type: text/plain; charset="utf-8" From: Zhao Mengmeng When compiling sched_ext selftests using clang 17.0.6, it raised compiler crash and build error: Error at line 68: Unsupport signed division for DAG: 0x55b2f9a60240: i64 =3D sdiv 0x55b2f9a609b0, Constant:i64<100>, peek_dsq.bpf.c:68:25 @[ peek_dsq.bpf.c:95:4 @[ peek_dsq.bpf.c:169:8 @[ peek _dsq.bpf.c:140:6 ] ] ]Please convert to unsigned div/mod After digging, it's not a compiler error, clang supported Signed division only when using -mcpu=3Dv4, while we use -mcpu=3Dv3 currently, the better w= ay is to use unsigned div, see [1] for details. [1] https://github.com/llvm/llvm-project/issues/70433 Signed-off-by: Zhao Mengmeng Reviewed-by: Andrea Righi --- tools/testing/selftests/sched_ext/peek_dsq.bpf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/sched_ext/peek_dsq.bpf.c b/tools/testi= ng/selftests/sched_ext/peek_dsq.bpf.c index a3faf5bb49d6..784f2f6c1af9 100644 --- a/tools/testing/selftests/sched_ext/peek_dsq.bpf.c +++ b/tools/testing/selftests/sched_ext/peek_dsq.bpf.c @@ -58,14 +58,14 @@ static void record_peek_result(long pid) { u32 slot_key; long *slot_pid_ptr; - int ix; + u32 ix; =20 if (pid <=3D 0) return; =20 /* Find an empty slot or one with the same PID */ bpf_for(ix, 0, 10) { - slot_key =3D (pid + ix) % MAX_SAMPLES; + slot_key =3D ((u64)pid + ix) % MAX_SAMPLES; slot_pid_ptr =3D bpf_map_lookup_elem(&peek_results, &slot_key); if (!slot_pid_ptr) continue; --=20 2.43.0