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Wed, 4 Sep 2024 08:13:11 +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 JvHJGJcW2GbcfAAAD6G6ig (envelope-from ); Wed, 04 Sep 2024 08:13:11 +0000 Message-ID: Date: Wed, 4 Sep 2024 10:13:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/15] slab: add struct kmem_cache_args To: Christian Brauner , Jens Axboe , Jann Horn , Linus Torvalds , Mike Rapoport Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org References: <20240903-work-kmem_cache_args-v2-0-76f97e9a4560@kernel.org> <20240903-work-kmem_cache_args-v2-2-76f97e9a4560@kernel.org> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: <20240903-work-kmem_cache_args-v2-2-76f97e9a4560@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 8BF4140025 X-Stat-Signature: wymodxkxy7fetmxd3a689o6sycu7je34 X-Rspam-User: X-HE-Tag: 1725437593-630791 X-HE-Meta: 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 a6xREcn+ JdK0W1Am1x1FSat+5eOjlqe6NAMdc6BIImuT0bG6SqpeSlnoodn5yhfzMemPuJcxM+Ll+wjNkaio/YQEtJsjp/de25Sk08E6ICpB6jGqTzQm5y591aZ6cnpZdtMRkIOY4P3M8TyP+a3xeWHe7wdyUQNb9+gGHv/Q0PP3qsrcnmNtryT8sdN8+2AvYYngtmiwMHobiX22N1ed+2c3DCtIf4TiMljxh/OKnHO1iwUnVcv31kNPI6jNFXEazFacGyk5BgjVSc2hz2wDUpGoQKJNJfxnx6/bDvQCSMe021lCb137N7Tu1rurVdeUqnn+trXgm4G4zqGiAo5M03ojyFEOpGtMEFKnLNfBGggjb65gqLcGBu1M= 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: List-Subscribe: List-Unsubscribe: On 9/3/24 16:20, Christian Brauner wrote: You could describe that it's to hold less common args and there's __kmem_cache_create_args() that takes it, and do_kmem_cache_create_usercopy() is converted to it? Otherwise LGTM. > Signed-off-by: Christian Brauner > --- > include/linux/slab.h | 21 ++++++++++++++++ > mm/slab_common.c | 67 +++++++++++++++++++++++++++++++++++++++------------- > 2 files changed, 72 insertions(+), 16 deletions(-) > > diff --git a/include/linux/slab.h b/include/linux/slab.h > index 5b2da2cf31a8..79d8c8bca4a4 100644 > --- a/include/linux/slab.h > +++ b/include/linux/slab.h > @@ -240,6 +240,27 @@ struct mem_cgroup; > */ > bool slab_is_available(void); > > +/** > + * @align: The required alignment for the objects. > + * @useroffset: Usercopy region offset > + * @usersize: Usercopy region size > + * @freeptr_offset: Custom offset for the free pointer in RCU caches > + * @use_freeptr_offset: Whether a @freeptr_offset is used > + * @ctor: A constructor for the objects. > + */ > +struct kmem_cache_args { > + unsigned int align; > + unsigned int useroffset; > + unsigned int usersize; > + unsigned int freeptr_offset; > + bool use_freeptr_offset; > + void (*ctor)(void *); > +}; > + > +struct kmem_cache *__kmem_cache_create_args(const char *name, > + unsigned int object_size, > + struct kmem_cache_args *args, > + slab_flags_t flags); > struct kmem_cache *kmem_cache_create(const char *name, unsigned int size, > unsigned int align, slab_flags_t flags, > void (*ctor)(void *)); > diff --git a/mm/slab_common.c b/mm/slab_common.c > index 91e0e36e4379..0f13c045b8d1 100644 > --- a/mm/slab_common.c > +++ b/mm/slab_common.c > @@ -248,14 +248,24 @@ static struct kmem_cache *create_cache(const char *name, > return ERR_PTR(err); > } > > -static struct kmem_cache * > -do_kmem_cache_create_usercopy(const char *name, > - unsigned int size, unsigned int freeptr_offset, > - unsigned int align, slab_flags_t flags, > - unsigned int useroffset, unsigned int usersize, > - void (*ctor)(void *)) > +/** > + * __kmem_cache_create_args - Create a kmem cache > + * @name: A string which is used in /proc/slabinfo to identify this cache. > + * @object_size: The size of objects to be created in this cache. > + * @args: Arguments for the cache creation (see struct kmem_cache_args). > + * @flags: See %SLAB_* flags for an explanation of individual @flags. > + * > + * Cannot be called within a interrupt, but can be interrupted. > + * > + * Return: a pointer to the cache on success, NULL on failure. > + */ > +struct kmem_cache *__kmem_cache_create_args(const char *name, > + unsigned int object_size, > + struct kmem_cache_args *args, > + slab_flags_t flags) > { > struct kmem_cache *s = NULL; > + unsigned int freeptr_offset = UINT_MAX; > const char *cache_name; > int err; > > @@ -275,7 +285,7 @@ do_kmem_cache_create_usercopy(const char *name, > > mutex_lock(&slab_mutex); > > - err = kmem_cache_sanity_check(name, size); > + err = kmem_cache_sanity_check(name, object_size); > if (err) { > goto out_unlock; > } > @@ -296,12 +306,14 @@ do_kmem_cache_create_usercopy(const char *name, > > /* Fail closed on bad usersize of useroffset values. */ > if (!IS_ENABLED(CONFIG_HARDENED_USERCOPY) || > - WARN_ON(!usersize && useroffset) || > - WARN_ON(size < usersize || size - usersize < useroffset)) > - usersize = useroffset = 0; > - > - if (!usersize) > - s = __kmem_cache_alias(name, size, align, flags, ctor); > + WARN_ON(!args->usersize && args->useroffset) || > + WARN_ON(object_size < args->usersize || > + object_size - args->usersize < args->useroffset)) > + args->usersize = args->useroffset = 0; > + > + if (!args->usersize) > + s = __kmem_cache_alias(name, object_size, args->align, flags, > + args->ctor); > if (s) > goto out_unlock; > > @@ -311,9 +323,11 @@ do_kmem_cache_create_usercopy(const char *name, > goto out_unlock; > } > > - s = create_cache(cache_name, size, freeptr_offset, > - calculate_alignment(flags, align, size), > - flags, useroffset, usersize, ctor); > + if (args->use_freeptr_offset) > + freeptr_offset = args->freeptr_offset; > + s = create_cache(cache_name, object_size, freeptr_offset, > + calculate_alignment(flags, args->align, object_size), > + flags, args->useroffset, args->usersize, args->ctor); > if (IS_ERR(s)) { > err = PTR_ERR(s); > kfree_const(cache_name); > @@ -335,6 +349,27 @@ do_kmem_cache_create_usercopy(const char *name, > } > return s; > } > +EXPORT_SYMBOL(__kmem_cache_create_args); > + > +static struct kmem_cache * > +do_kmem_cache_create_usercopy(const char *name, > + unsigned int size, unsigned int freeptr_offset, > + unsigned int align, slab_flags_t flags, > + unsigned int useroffset, unsigned int usersize, > + void (*ctor)(void *)) > +{ > + struct kmem_cache_args kmem_args = { > + .align = align, > + .use_freeptr_offset = freeptr_offset != UINT_MAX, > + .freeptr_offset = freeptr_offset, > + .useroffset = useroffset, > + .usersize = usersize, > + .ctor = ctor, > + }; > + > + return __kmem_cache_create_args(name, size, &kmem_args, flags); > +} > + > > /** > * kmem_cache_create_usercopy - Create a cache with a region suitable >