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bh=eye96+7HSXT6nu/JM5zabUMkyUuxngRNpv5ElZUqX4c=; b=p/PrOTMGGm88jrN5vD7exhmAjgohcls5kA3u4CFexFt34Fe7Mynf6QEJnzBuphJ8m0CQE7 v48fuUZTEoKfeuAg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 0303513974; Wed, 2 Oct 2024 12:09:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 4rsMAPs3/WZ6BAAAD6G6ig (envelope-from ); Wed, 02 Oct 2024 12:09:30 +0000 Message-ID: <4dadf9be-a349-4a19-ae9c-652ade9e2198@suse.cz> Date: Wed, 2 Oct 2024 14:09:30 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] mm/slab: remove duplicate check in create_cache() Content-Language: en-US To: Zhen Lei , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240821032637.1930-1-thunder.leizhen@huawei.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1D63821BAF X-Spam-Level: X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TAGGED_RCPT(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_TO(0.00)[huawei.com,linux.com,kernel.org,google.com,lge.com,linux-foundation.org,linux.dev,gmail.com,kvack.org,vger.kernel.org]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_SEVEN(0.00)[10]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:dkim,suse.cz:mid]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.cz:+] X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -3.01 X-Spam-Flag: NO On 8/21/24 05:26, Zhen Lei wrote: > The WARN_ON() check in static function create_cache() is done by its only > parent kmem_cache_create_usercopy() before calling it. > if (... > WARN_ON(size < usersize || size - usersize < useroffset)) > usersize = useroffset = 0; > ... > s = create_cache(..., size, ..., useroffset, usersize, ...); > > Therefore, the WARN_ON() check in create_cache() can be safely removed. > > Signed-off-by: Zhen Lei Hi, sorry for the late reply. This code was heavily refactored as of 6.12-rc1. Can you check if it's still the case and send updated patch? Thanks, Vlastimil > --- > mm/slab_common.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/mm/slab_common.c b/mm/slab_common.c > index 40b582a014b8f2f..3069c9095523484 100644 > --- a/mm/slab_common.c > +++ b/mm/slab_common.c > @@ -210,9 +210,6 @@ static struct kmem_cache *create_cache(const char *name, > struct kmem_cache *s; > int err; > > - if (WARN_ON(useroffset + usersize > object_size)) > - useroffset = usersize = 0; > - > err = -ENOMEM; > s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL); > if (!s)