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Mon, 27 May 2024 07:46:03 +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 uD9YBTs6VGbhWAAAD6G6ig (envelope-from ); Mon, 27 May 2024 07:46:03 +0000 Message-ID: <68b85796-c674-4691-936a-2051849f4692@suse.cz> Date: Mon, 27 May 2024 09:46:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US From: Vlastimil Babka To: "linux-mm@kvack.org" , RCU , cocci@inria.fr Subject: patch idea: convert trivial call_rcu users to kfree_rcu 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== Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: 52D514000A X-Stat-Signature: k3bm9qo3uzqdugm6ca46j1m7ab46wdoi X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1716795967-942661 X-HE-Meta: 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 M6AMbhjO 6OrUFzhALW9WtdnoBFlZCgE7DWkXwdX2W+2bzu53b6BPCerg2p52Fm0pRU5fhaw3blciQvUKO6A4ETCNBfHRgGBHXnx8VXPXkKRl4huiK+1LRURasNDuQorZC/K6ZVP3x1rDMTDRI4CajvKfPeJUTQDDcFJ2KYjkOz+01cX3x3d1I83XvCjgejGp/Nag5uXr8V3qcgmTIgXbqMZk85KGWgsdbSGsE9kDhsigDHHm2EBPwy1VUtL3BsolHT/Uuqn2iN5U0+S0rVvr1bUwcs1C+bvoegGWFTL0hP4KHjXkQRDV7xdHaiP2iuMPJ5aYLKixwgr1eM60bItGChzv+pKAgZcXQjncJbS8Axiuf X-Bogosity: Ham, tests=bogofilter, spamicity=0.002822, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, one bit from LSF/MM discussions is that there might be call_rcu users with a callback that only does a kmem_cache_free() to a specific cache. Since SLOB was removed, it's always ok to use kfree() and thus also kfree_rcu() on allocations from kmem_cache_alloc() in addition to kmalloc(). Thus, such call_rcu() users might be simplified to kfree_rcu(). I found some cases semi-manually, but I'd expect coccinelle could help here so if anyone wants to take this task, feel free to. Vlastimil