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Wed, 11 Aug 2021 08:55:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id wc/HJYeQE2GudwAAGKfGzw (envelope-from ); Wed, 11 Aug 2021 08:55:35 +0000 Subject: Re: [PATCH v4 29/35] mm: slub: Move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context From: Vlastimil Babka To: Qian Cai , Andrew Morton , Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Galbraith , Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Jann Horn References: <20210805152000.12817-1-vbabka@suse.cz> <20210805152000.12817-30-vbabka@suse.cz> <0b36128c-3e12-77df-85fe-a153a714569b@quicinc.com> <50fe26ba-450b-af57-506d-438f67cfbce3@suse.cz> Message-ID: <60e50d8c-ccfa-1036-5a03-2b1a9d25f958@suse.cz> Date: Wed, 11 Aug 2021 10:55:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <50fe26ba-450b-af57-506d-438f67cfbce3@suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 83A624FA5 Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=UFqYaCyR; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b="cDO8H1F/"; dmarc=none; spf=pass (imf22.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: bkd656ni344x4c8r6ye1q17mf5gujfzw X-HE-Tag: 1628672137-14399 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 8/10/21 4:33 PM, Vlastimil Babka wrote: > On 8/9/21 3:41 PM, Qian Cai wrote: > >>> static void flush_all(struct kmem_cache *s) >>> { >>> - on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1); >>> + struct slub_flush_work *sfw; >>> + unsigned int cpu; >>> + >>> + mutex_lock(&flush_lock); >> >> Vlastimil, taking the lock here could trigger a warning during memory offline/online due to the locking order: >> >> slab_mutex -> flush_lock > > Here's the full fixup, also incorporating Mike's fix. Thanks. > One more fixup, sorry for the churn. ----8<---- >From 7cfe3fb1bcd6e589199b10bef480ed097ba9de14 Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Wed, 11 Aug 2021 10:51:14 +0200 Subject: [PATCH] mm, slub: fix memory and cpu hotplug related lock ordering issues - fix Make __kmem_cache_do_shrink static to silence "no previous prototype" warning. Reported-by: kernel test robot Signed-off-by: Vlastimil Babka --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 152487f84025..c9531e03addd 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4393,7 +4393,7 @@ EXPORT_SYMBOL(kfree); * being allocated from last increasing the chance that the last objects * are freed in them. */ -int __kmem_cache_do_shrink(struct kmem_cache *s) +static int __kmem_cache_do_shrink(struct kmem_cache *s) { int node; int i; -- 2.32.0