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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.3 Subject: Re: [PATCH v3] mm/slab: Annotate kmem_cache_node->list_lock as raw Content-Language: en-US To: Jiri Kosina , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666617617; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=B+FHugioHev0dYpi/nUm07zjo089onS6uPsLiTaY09U=; b=z74gAsMxi7yQtvsTwNLeoSMt2aSE6/42BOpJ3EH1MFee258vDkZf9e4FVMBPGNSj5FQ1jn qpglXaimS6YC0AsCLSwv+MAd7XUSHP+ZjDAB1jjEsxm5A0X+4k1OlnfZ9DRvddUmnO9ADQ 3zziXFpjYWU7rgDSuhQBO+IOsRzbAVg= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=YGnOEXMU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=rw+pgQMR; spf=pass (imf29.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666617617; a=rsa-sha256; cv=none; b=WEupOVpilvzbT51JAgV+Lp0UWfi6S+pLbCGbr0xG7D5dlVzWWitlLBKQincEF6JVCPGdsR 1T0PMXriKUCTD9YD7JFXe5eZebO7OMy4ueZTJT5JyqYYVK1IBtg7aoZ4S14NO+Us3LZJon ZDGpq1WxSEb/Sz9s6cHZzfPXl+qj1rk= X-Stat-Signature: 4mp4c7fbsqszg53mdwe4im65thme77cg X-Rspam-User: Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=YGnOEXMU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=rw+pgQMR; spf=pass (imf29.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: DC721120045 X-HE-Tag: 1666617616-980756 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 10/21/22 21:18, Jiri Kosina wrote: > From: Jiri Kosina > > The list_lock can be taken in hardirq context when do_drain() is being > called via IPI on all cores, and therefore lockdep complains about it, > because it can't be preempted on PREEMPT_RT. > > That's not a real issue, as SLAB can't be built on PREEMPT_RT anyway, but > we still want to get rid of the warning on non-PREEMPT_RT builds. > > Annotate it therefore as a raw lock in order to get rid of he lockdep > warning below. > > ============================= > [ BUG: Invalid wait context ] > 6.1.0-rc1-00134-ge35184f32151 #4 Not tainted > ----------------------------- > swapper/3/0 is trying to lock: > ffff8bc88086dc18 (&parent->list_lock){..-.}-{3:3}, at: do_drain+0x57/0xb0 > other info that might help us debug this: > context-{2:2} > no locks held by swapper/3/0. > stack backtrace: > CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.1.0-rc1-00134-ge35184f32151 #4 > Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017 > Call Trace: > > dump_stack_lvl+0x6b/0x9d > __lock_acquire+0x1519/0x1730 > ? build_sched_domains+0x4bd/0x1590 > ? __lock_acquire+0xad2/0x1730 > lock_acquire+0x294/0x340 > ? do_drain+0x57/0xb0 > ? sched_clock_tick+0x41/0x60 > _raw_spin_lock+0x2c/0x40 > ? do_drain+0x57/0xb0 > do_drain+0x57/0xb0 > __flush_smp_call_function_queue+0x138/0x220 > __sysvec_call_function+0x4f/0x210 > sysvec_call_function+0x4b/0x90 > > > asm_sysvec_call_function+0x16/0x20 > RIP: 0010:mwait_idle+0x5e/0x80 > Code: 31 d2 65 48 8b 04 25 80 ed 01 00 48 89 d1 0f 01 c8 48 8b 00 a8 08 75 14 66 90 0f 00 2d 0b 78 46 00 31 c0 48 89 c1 fb 0f 01 c9 06 fb 0f 1f 44 00 00 65 48 8b 04 25 80 ed 01 00 f0 80 60 02 df > RSP: 0000:ffffa90940217ee0 EFLAGS: 00000246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9bb9f93a > RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000001 > R10: ffffa90940217ea8 R11: 0000000000000000 R12: ffffffffffffffff > R13: 0000000000000000 R14: ffff8bc88127c500 R15: 0000000000000000 > ? default_idle_call+0x1a/0xa0 > default_idle_call+0x4b/0xa0 > do_idle+0x1f1/0x2c0 > ? _raw_spin_unlock_irqrestore+0x56/0x70 > cpu_startup_entry+0x19/0x20 > start_secondary+0x122/0x150 > secondary_startup_64_no_verify+0xce/0xdb > > > Signed-off-by: Jiri Kosina Thanks, added to slab/for-6.2/locking ... > diff --git a/mm/slab.h b/mm/slab.h > index 0202a8c2f0d2..7a705e4228c8 100644 > --- a/mm/slab.h > +++ b/mm/slab.h > @@ -750,7 +750,11 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, > * The slab lists for all objects. > */ > struct kmem_cache_node { > +#ifdef CONFIG_SLAB > + raw_spinlock_t list_lock; > +#else > spinlock_t list_lock; > +#endif > > #ifdef CONFIG_SLAB > struct list_head slabs_partial; /* partial list first, better asm code */ Simplified a bit. Since we already have CONFIG_SLAB/CONFIG_SLUB #ifdef sections, moved the list_lock there.