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Received: from viro by zeniv.linux.org.uk with local (Exim 4.99 #2 (Red Hat Linux)) id 1vgTH0-00000002NbF-3BWn; Thu, 15 Jan 2026 19:44:50 +0000 Date: Thu, 15 Jan 2026 19:44:50 +0000 From: Al Viro To: "Christoph Lameter (Ampere)" Cc: linux-mm@kvack.org, Vlastimil Babka , Harry Yoo , linux-fsdevel@vger.kernel.org, Linus Torvalds , Christian Brauner , Jan Kara , Mateusz Guzik , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 00/15] kmem_cache instances with static storage duration Message-ID: <20260115194450.GA3634291@ZenIV> References: <20260110040217.1927971-1-viro@zeniv.linux.org.uk> <0727b5a1-078f-0055-fc52-61b80bc5d59e@gentwo.org> <20260115020850.GX3634291@ZenIV> <806cbde4-fc0b-7bf7-d22a-2205b46eaa96@gentwo.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <806cbde4-fc0b-7bf7-d22a-2205b46eaa96@gentwo.org> X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 16D7340004 X-Stat-Signature: f13fhxb67hstkjrpi9dw46tiiopddccw X-HE-Tag: 1768506204-670441 X-HE-Meta: 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 Rq/KYcm5 tfT6Md3CJ9PD6QawkTfZd77BC7Cb6G4L2vvijItZnCKuanelyWlIbmacFn5oZJovxYrY1N/US2k35SVd/TufOhJc5U1Mo60LkJYpHmGSwCs17Axgj4x3BFjn40R44ebIJeI6q7OFfxegUCl71zaEwOnG8TjInJwhscb3K4lYLWdNZ9wltfb5K73lVwAk5p4h9KtOqrZle3wrrt4YmEReELV44plpYSc0SxJoyfQDNLtZXk9+mU3aAQOW5Sudb13UzJr9XW5dJjBKJxCBt8ok7gnwIhCmnVOwMAHbsSnUPnLHFJ7ciq/BXSu0ib7q4MK2h9OtrtjhydZ/wl+X5knn33ztpZswm+1RcDlxMpNZXblD6VpTwWie5F2GQI7Mq/OGyA3hM70oWbQ/hMC1zlAUaHZ64PmkCTR08yDw2N8jQoehB2OzLcD0hd2/pg7vo39obeHqFKotef4jRWEbU8ipgFbVai5YTFGsS7BRTA5drhLwgxOQ= 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 Thu, Jan 15, 2026 at 11:10:00AM -0800, Christoph Lameter (Ampere) wrote: > Internal functions exist in the slab allocator that do what you want if > the opaqueness requirement is dropped. F.e. for the creation of kmalloc > caches we use do_kmem_cache_create(): Yes, I know. Do you really want to expose e.g. slab_caches and slab_mutex to the rest of the kernel? Surgery needed to have __kmem_cache_create() do everything is not large - see the mm/slab_common.c parts in the first two commits in this series.