From nobody Tue Oct 7 15:01:47 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1448328FFFB; Wed, 9 Jul 2025 10:42:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752057768; cv=none; b=fVF8UZC7hK9tn9sDflKR8pNPZ2O/8ndxyHg+541fEBohqWgiO0fcV9g3k9lvctKMQZ7dka1y3SBS+BdWKFN+NuCvgqa4fGmd015mDib306l4QTkkzjcRs8Y6CajhRW/6j7hiMSHcCLFm+bbeAuqlZQcFmmx9sL0ueAl5Kp9PnDU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752057768; c=relaxed/simple; bh=wKdPJPJ/I6sElxr2X9zIgE1Q3fP7t2VCbZRiKZAMmwU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=pIeOAEO/wudYVfBW5AekgKLjxfCGaCbhOWzE/ghPNAM47uVSoa7p98VnFMB14SJ/x05h6fH9xbGgItrBtsz+c6SWe7JVBQhuZUR0WtTFud1OnNpxwrJ1mjNIGMJThMtY3SKb8Do0+O3SS998jZMtiW80/zBuL3lA5VyPfUXzJnY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dT8Uvg88; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dT8Uvg88" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6CB2C4CEEF; Wed, 9 Jul 2025 10:42:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752057767; bh=wKdPJPJ/I6sElxr2X9zIgE1Q3fP7t2VCbZRiKZAMmwU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dT8Uvg88EFyM/JUm8nXkWLtPg7Egt7t/Zg1orojILyEBvhWWMw4dq4DcHglwxugzb OSzUFh9PIz7U8OetbxhDfRmTjn4GuM5cVpfcACBbUD/P72e5fbDhOOjdwQKYqJjBDU epB5uS4lj0B/xfTfdpktxQ+ToR00FjWzLCkX2vNtiBzcXrKA20WicR+nshuHET5Czt +3/YiLcSsOwM2cv2JrTO8oP0+2GgtA+7kh7887Np93jQVQO+p7yg4tFsw3pbmB2Lwn hEW+39X8447PDk6RGgbPYbKWdxKHU45oFbhv5rauqmv3jPz82eeFDD1svZbJ4rOgHt mCATuBXYvC86w== From: neeraj.upadhyay@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, paulmck@kernel.org, joelagnelf@nvidia.com, frederic@kernel.org, boqun.feng@gmail.com, urezki@gmail.com, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang1211@gmail.com, neeraj.iitr10@gmail.com, neeraj.upadhyay@amd.com, "Neeraj Upadhyay (AMD)" , kernel test robot Subject: [PATCH rcu 03/15] rcutorture: Make rcutorture_one_extend_check() account for hard IRQs Date: Wed, 9 Jul 2025 16:12:03 +0530 Message-Id: <20250709104215.15562-4-neeraj.upadhyay@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20250709104215.15562-1-neeraj.upadhyay@kernel.org> References: <20250709104215.15562-1-neeraj.upadhyay@kernel.org> 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 Content-Type: text/plain; charset="utf-8" From: "Paul E. McKenney" This commit retrospectively prepares for testing of RCU readers invoked from hardware interrupt handlers (for example, HRTIMER_MODE_HARD hrtimer handlers) in kernels built with CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=3Dy, which is rarely used but sometimes extremely useful. This preparation involves taking early exits if in_hardirq(), and, while we are in the area, a very early exit if in_nmi(). This means that a number of insoftirq parameters are no longer needed, but that is the subject of a later commit. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202505140917.8ee62cc6-lkp@intel.com Signed-off-by: Paul E. McKenney Tested-by: kernel test robot Signed-off-by: Neeraj Upadhyay (AMD) --- kernel/rcu/rcutorture.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index a209d2419cfd..7944cc69321d 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1920,10 +1920,10 @@ static void rcutorture_one_extend_check(char *s, in= t curstate, int new, int old, { int mask; =20 - if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE)) + if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE) || in_nmi()) return; =20 - WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled(), ROEC_ARGS); + WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled() && !in_hard= irq(), ROEC_ARGS); WARN_ONCE((curstate & RCUTORTURE_RDR_IRQ) && !irqs_disabled(), ROEC_ARGS); =20 // If CONFIG_PREEMPT_COUNT=3Dn, further checks are unreliable. @@ -1938,9 +1938,9 @@ static void rcutorture_one_extend_check(char *s, int = curstate, int new, int old, (curstate & (RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2)) && cur_ops->readlock_nesting() =3D=3D 0, ROEC_ARGS); =20 - // Timer handlers have all sorts of stuff disabled, so ignore + // Interrupt handlers have all sorts of stuff disabled, so ignore // unintended disabling. - if (insoftirq) + if (in_serving_softirq() || in_hardirq()) return; =20 WARN_ONCE(cur_ops->extendables && --=20 2.40.1