From nobody Thu Dec 18 20:00:49 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 BFD27202C4F; Wed, 4 Dec 2024 23:26:17 +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=1733354777; cv=none; b=MFeOXUrvgNRHmfq0H8+AeYKU+TSQgxGGySQJ8RhDkvYPC0xOZGHkaHY6adt0GY05dIELMo7IFE5qLwjFwZQPAx8u+XVsDm1Ug/vZZK1XrFF+K2U5zohB9zvEj+3BH28YTfpzxvihhPmstsLLBCgdZgT0V/O8v9RoB2DerYegy3w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733354777; c=relaxed/simple; bh=gFF5Zu+PVc4pu8Aty8CKqrK4CCZ9Ay14XcEr7z9OAjs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ilhI5lFwHgma32V4mCs8HAqRnU/UYhHc1kJfWrYlo0C00AvkoWepy77IybffVMAFkRW1hycGMA2a92dJLD1GN8xwo+uvfIVo4hEKPVqWno3wMkEPHh5miuwJOQCNWj3ECa9mlSPAPiz/kWBSamQh8tM3c6EqySn7LlPvLG7nXE0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=U+TNg1zr; 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="U+TNg1zr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D2D8C4CECD; Wed, 4 Dec 2024 23:26:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733354777; bh=gFF5Zu+PVc4pu8Aty8CKqrK4CCZ9Ay14XcEr7z9OAjs=; h=From:To:Cc:Subject:Date:From; b=U+TNg1zr85aHifQ6X91gEobkk5ow+Bxx3iEr3/0UiqqxaW6iBdaqDFkE4jEj/b/tA uye+34D3nv9FrhE2jAk0hN/lOHHecaN3LWuMZgZq1RMU4E2y3I8dbjFaJYnjrQwwfn dI5XeHiaZw8QwWqOkb1KFBtmylJaSeWQB7Ypj3Xk2GqTi2Q2XFKzspy01GhMGouHP/ k05ORnzaAVW0az8INjL1XRm+lg2/s/oGSPqK/cxYJGLtSS3a5/a4rS7IC+x09guC0j Y/AVEbNQurry7aMWhZ5vtPTKbXWkWLDKdvp7oi8QW8lLfX46BQ7xcNii6VozPXkcnm uAzXgy4IMORSQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Huacai Chen , Sasha Levin , chenhuacai@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, yangtiezhu@loongson.cn, hejinyang@loongson.cn, tangyouling@loongson.cn, loongarch@lists.linux.dev, linux-rt-devel@lists.linux.dev Subject: [PATCH AUTOSEL 6.1] LoongArch: Fix sleeping in atomic context for PREEMPT_RT Date: Wed, 4 Dec 2024 17:14:54 -0500 Message-ID: <20241204221457.2247288-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.119 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Huacai Chen [ Upstream commit 88fd2b70120d52c1010257d36776876941375490 ] Commit bab1c299f3945ffe79 ("LoongArch: Fix sleeping in atomic context in setup_tlb_handler()") changes the gfp flag from GFP_KERNEL to GFP_ATOMIC for alloc_pages_node(). However, for PREEMPT_RT kernels we can still get a "sleeping in atomic context" error: [ 0.372259] BUG: sleeping function called from invalid context at kernel= /locking/spinlock_rt.c:48 [ 0.372266] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, na= me: swapper/1 [ 0.372268] preempt_count: 1, expected: 0 [ 0.372270] RCU nest depth: 1, expected: 1 [ 0.372272] 3 locks held by swapper/1/0: [ 0.372274] #0: 900000000c9f5e60 (&pcp->lock){+.+.}-{3:3}, at: get_page= _from_freelist+0x524/0x1c60 [ 0.372294] #1: 90000000087013b8 (rcu_read_lock){....}-{1:3}, at: rt_sp= in_trylock+0x50/0x140 [ 0.372305] #2: 900000047fffd388 (&zone->lock){+.+.}-{3:3}, at: __rmque= ue_pcplist+0x30c/0xea0 [ 0.372314] irq event stamp: 0 [ 0.372316] hardirqs last enabled at (0): [<0000000000000000>] 0x0 [ 0.372322] hardirqs last disabled at (0): [<9000000005947320>] copy_pro= cess+0x9c0/0x26e0 [ 0.372329] softirqs last enabled at (0): [<9000000005947320>] copy_pro= cess+0x9c0/0x26e0 [ 0.372335] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 0.372341] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.12.0-rc7+= #1891 [ 0.372346] Hardware name: Loongson Loongson-3A5000-7A1000-1w-CRB/Loongs= on-LS3A5000-7A1000-1w-CRB, BIOS vUDK2018-LoongArch-V2.0.0-prebeta9 10/21/20= 22 [ 0.372349] Stack : 0000000000000089 9000000005a0db9c 90000000071519c8 9= 000000100388000 [ 0.372486] 900000010038b890 0000000000000000 900000010038b898 9= 000000007e53788 [ 0.372492] 900000000815bcc8 900000000815bcc0 900000010038b700 0= 000000000000001 [ 0.372498] 0000000000000001 4b031894b9d6b725 00000000055ec000 9= 000000100338fc0 [ 0.372503] 00000000000000c4 0000000000000001 000000000000002d 0= 000000000000003 [ 0.372509] 0000000000000030 0000000000000003 00000000055ec000 0= 000000000000003 [ 0.372515] 900000000806d000 9000000007e53788 00000000000000b0 0= 000000000000004 [ 0.372521] 0000000000000000 0000000000000000 900000000c9f5f10 0= 000000000000000 [ 0.372526] 90000000076f12d8 9000000007e53788 9000000005924778 0= 000000000000000 [ 0.372532] 00000000000000b0 0000000000000004 0000000000000000 0= 000000000070000 [ 0.372537] ... [ 0.372540] Call Trace: [ 0.372542] [<9000000005924778>] show_stack+0x38/0x180 [ 0.372548] [<90000000071519c4>] dump_stack_lvl+0x94/0xe4 [ 0.372555] [<900000000599b880>] __might_resched+0x1a0/0x260 [ 0.372561] [<90000000071675cc>] rt_spin_lock+0x4c/0x140 [ 0.372565] [<9000000005cbb768>] __rmqueue_pcplist+0x308/0xea0 [ 0.372570] [<9000000005cbed84>] get_page_from_freelist+0x564/0x1c60 [ 0.372575] [<9000000005cc0d98>] __alloc_pages_noprof+0x218/0x1820 [ 0.372580] [<900000000593b36c>] tlb_init+0x1ac/0x298 [ 0.372585] [<9000000005924b74>] per_cpu_trap_init+0x114/0x140 [ 0.372589] [<9000000005921964>] cpu_probe+0x4e4/0xa60 [ 0.372592] [<9000000005934874>] start_secondary+0x34/0xc0 [ 0.372599] [<900000000715615c>] smpboot_entry+0x64/0x6c This is because in PREEMPT_RT kernels normal spinlocks are replaced by rt spinlocks and rt_spin_lock() will cause sleeping. Fix it by disabling NUMA optimization completely for PREEMPT_RT kernels. Signed-off-by: Huacai Chen Signed-off-by: Sasha Levin --- arch/loongarch/mm/tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c index eeb2d815cfa2a..faf44cac403b4 100644 --- a/arch/loongarch/mm/tlb.c +++ b/arch/loongarch/mm/tlb.c @@ -279,7 +279,7 @@ void setup_tlb_handler(int cpu) /* Avoid lockdep warning */ rcu_cpu_starting(cpu); =20 -#ifdef CONFIG_NUMA +#if defined(CONFIG_NUMA) && !defined(CONFIG_PREEMPT_RT) vec_sz =3D sizeof(exception_handlers); =20 if (pcpu_handlers[cpu]) --=20 2.43.0