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Tue, 10 Feb 2026 14:08:23 +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 ccfbHNc7i2kINQAAD6G6ig (envelope-from ); Tue, 10 Feb 2026 14:08:23 +0000 Message-ID: <435e40be-fa79-4e57-83b4-5c3f5114cac2@suse.cz> Date: Tue, 10 Feb 2026 15:08:23 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V2 0/2] mm/slab: support kmalloc_nolock() -> kfree[_rcu]() Content-Language: en-US To: Harry Yoo , Andrew Morton Cc: Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Alexei Starovoitov , Catalin Marinas , Uladzislau Rezki , Suren Baghdasaryan , linux-mm@kvack.org References: <20260210044642.139482-1-harry.yoo@oracle.com> 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+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20260210044642.139482-1-harry.yoo@oracle.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: i35nomqk3k8a47gmptcef88kcaxfj5yz X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6801A1A0007 X-HE-Tag: 1770732505-136337 X-HE-Meta: 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 F72ayl/M go+DkRHgd2JJw0B8= 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 2/10/26 05:46, Harry Yoo wrote: > This is separated from the RFC version of "k[v]free_rcu() improvements" > series [1], as these changes are relatively small and beneficial for BPF > because it enables the bpf code to use kfree_rcu() instead of > call_rcu() + kfree_nolock(). > > Patch 1 allows kfree() and kfree_rcu() to be used with objects that are > allocated from kmalloc_nolock(). > > Patch 2 is a cleanup that frees a bit used to record whether obj_exts > was allocated using kmalloc_nolock() or kmalloc(), since now both cases > can be freed with kfree(). > > [1] https://lore.kernel.org/linux-mm/20260206093410.160622-1-harry.yoo@oracle.com Thanks, added to slab/for-next > v1 -> v2: > - Added Catalin's Reviewed-by tag on patch 1, and Alexei's Acked-by tag > on patch 2 that I forgot to add. Thanks! > > - Fix calling kfree() in free_slab_obj_exts() and alloc_slab_obj_exts() > when !allow_spin. Pass allow_spin parameter down to free_slab_obj_exts(). > > V1: https://lore.kernel.org/linux-mm/20260209121013.50475-1-harry.yoo@oracle.com > > Harry Yoo (2): > mm/slab: allow freeing kmalloc_nolock()'d objects using kfree[_rcu]() > mm/slab: drop the OBJEXTS_NOSPIN_ALLOC flag from enum objext_flags > > include/linux/memcontrol.h | 3 +-- > include/linux/rcupdate.h | 4 ++-- > mm/kmemleak.c | 22 ++++++++++----------- > mm/slub.c | 39 +++++++++++++++++++++++++++----------- > 4 files changed, 41 insertions(+), 27 deletions(-) > > > base-commit: f6ed7e47c1fc78e78c9bfeb668b1ad9ba5c58120