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Mon, 12 Jan 2026 15:16:57 +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 oEhwC2kQZWn7FgAAD6G6ig (envelope-from ); Mon, 12 Jan 2026 15:16:57 +0000 From: Vlastimil Babka Date: Mon, 12 Jan 2026 16:16:55 +0100 Subject: [PATCH RFC v2 01/20] mm/slab: add rcu_barrier() to kvfree_rcu_barrier_on_cache() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260112-sheaves-for-all-v2-1-98225cfb50cf@suse.cz> References: <20260112-sheaves-for-all-v2-0-98225cfb50cf@suse.cz> In-Reply-To: <20260112-sheaves-for-all-v2-0-98225cfb50cf@suse.cz> To: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin Cc: Hao Li , Andrew Morton , Uladzislau Rezki , "Liam R. Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com, Vlastimil Babka , kernel test robot , stable@vger.kernel.org X-Mailer: b4 0.14.3 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Rspam-User: X-Stat-Signature: 3zdboz6o95omj9hpknjnaqea9x4cfqs3 X-Rspamd-Queue-Id: 11BEC1C000C X-Rspamd-Server: rspam04 X-HE-Tag: 1768231018-688803 X-HE-Meta: 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 Nld/pv63 qXdQA2TnfE8vYJDciLJbZxi/sisu5B3CRmdVa/4V3haFE0uVcSXfbsmbmud92wiF6H+VCrYqe5cXIqB2DHlo5hoVWZ+GiWqa/BjSsuvaSpNGoPSwVl0oI/qJTpBHoHoYvLUjJTmv8l5S1vmjB/Y3PInSMr5/WFeTmstxeW88qc+TyjlWsIgrbJzLi4hA+jKZUUi5welEzGKPzzeiNNMzXEeeBGP3B3ftE6LXquWpD1YBSEkexthhBI3D7v1uUUArent3DkNHeZUJoODmVG+FMNHEcD9Xx7RoKApjmtJYnZonJD48xv8Mt2wpSxOSnHE+CCYPNihe87FRSYFZMfUXgDq4xVg== 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: After we submit the rcu_free sheaves to call_rcu() we need to make sure the rcu callbacks complete. kvfree_rcu_barrier() does that via flush_all_rcu_sheaves() but kvfree_rcu_barrier_on_cache() doesn't. Fix that. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202601121442.c530bed3-lkp@intel.com Fixes: 0f35040de593 ("mm/slab: introduce kvfree_rcu_barrier_on_cache() for cache destruction") Cc: stable@vger.kernel.org Signed-off-by: Vlastimil Babka --- mm/slab_common.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index eed7ea556cb1..ee994ec7f251 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -2133,8 +2133,11 @@ EXPORT_SYMBOL_GPL(kvfree_rcu_barrier); */ void kvfree_rcu_barrier_on_cache(struct kmem_cache *s) { - if (s->cpu_sheaves) + if (s->cpu_sheaves) { flush_rcu_sheaves_on_cache(s); + rcu_barrier(); + } + /* * TODO: Introduce a version of __kvfree_rcu_barrier() that works * on a specific slab cache. -- 2.52.0