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Howlett" , Suren Baghdasaryan , Alexei Starovoitov , linux-mm , LKML , linux-rt-devel@lists.linux.dev, bpf , kasan-dev Subject: Re: [PATCH RFC v2 06/20] slab: make percpu sheaves compatible with kmalloc_nolock()/kfree_nolock() Message-ID: <20260114150747.ziWhVVQM@linutronix.de> References: <20260112-sheaves-for-all-v2-0-98225cfb50cf@suse.cz> <20260112-sheaves-for-all-v2-6-98225cfb50cf@suse.cz> <20260113183604.ykHFYvV2@linutronix.de> <596a5461-eb50-40e5-88ca-d5dbe1fc6a67@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 613FD2000B X-Stat-Signature: wm7ia5pdppok8akziskq5etskze95mb3 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1768403271-671740 X-HE-Meta: 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 xt7UlPL3 Yr1JcQf9ZEvM7PDdP8uxicQKKTC/3wK2hphjc 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 2026-01-14 15:05:34 [+0100], Vlastimil Babka wrote: > > Yes IIRC Hao Li pointed that out before. We'll be able to remove that > > !preemptible() check that we area about to add by the patch above. > > > > But I'm not sure we can remove (or "not put back") the "in_nmi() || > > in_hardirq()" too, because as you said it was added with different reasoning > > initially? > > Ah right, it was "copied" from alloc_frozen_pages_nolock_noprof() where it's > explained more, and AFAICS will be still applicable with sheaves. We should > add a comment to kmalloc_nolock() referring to the > alloc_frozen_pages_nolock_noprof() comment... Right. This looks halfway what I remember. And this was works in atomic context on RT because of rmqueue_pcplist()/ pcp_spin_trylock() usage. Sebastian