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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774985077; bh=ca2PhavqgDv2R9in2fzAJY6/zNAPdq8KaVAU3DEM2AI=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=MetRsd341qzHrULJEq2bVsKizErCgynV7J0GC7Q2dtCkgw8QiIApupfym6tT996Vu IISFGcC3jVQlAur409SfraNezvSw4WypGqwN4V4ZXJjNNr1iCmau04fVq0IMZXDx8z VSSaCyUYxaRgEvERiarMBBEx4fowr+qorp1yy4bZ0l6u2f4kiMorT62wjgKx8HBcL3 fq79rhf6s/PIpCSdwFUBLayJ8vgkG3cLLkk+KCWbybagL/84GoZtn9Um0PqqrGcShS /0j+A32slRa5B73MY3PTIb8/MTJ4c+CWNnf1zg/R3yQx1pk82bOkDS42BSV2OmWTai 1fFL5RyLzHqKA== From: Pratyush Yadav To: Pasha Tatashin Cc: rppt@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, dmatlack@google.com, pratyush@kernel.org, skhawaja@google.com Subject: Re: [PATCH v3 03/10] liveupdate: Protect file handler list with rwsem In-Reply-To: <20260327033335.696621-4-pasha.tatashin@soleen.com> (Pasha Tatashin's message of "Fri, 27 Mar 2026 03:33:27 +0000") References: <20260327033335.696621-1-pasha.tatashin@soleen.com> <20260327033335.696621-4-pasha.tatashin@soleen.com> Date: Tue, 31 Mar 2026 19:24:33 +0000 Message-ID: <2vxzwlyrhkem.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Stat-Signature: d9nx66453gtc1oydaws6qthrqkcrcz8u X-Rspamd-Queue-Id: 44676100005 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1774985078-353916 X-HE-Meta: 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 fCITHj8e Jd1TeIvZyIHkdHcElk0Jx7EQ2MKoJ2Snsr33SSRrRPN23VeKazpNDJyzz3MtYRisLkajkvKBbb3DpzD8keunfZIpMdRpI0eEQ1k0yIbCwhOYylr4aQOCa60/+UAz2zgqwy/dvDeQZwPsSYLajaSMX83ItLF5f8Ri4dReAEBdt38cXONYV/oY3Qe/3SYeXkVy7KJ96YbjiMRzgT/YOEP++BSIK2oUsYOrIywKhi/6blH8DFzkmdC8YuMp3nyeibzm9w+AsLOD55XDgLH121UXxHvadUx/blg3McfHZO2ZfvG2BXyI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 27 2026, Pasha Tatashin wrote: > Because liveupdate file handlers will no longer hold a module reference > when registered, we must ensure that the access to the handler list is > protected against concurrent module unloading. > > Utilize the global luo_register_rwlock to protect the global registry of > file handlers. Read locks are taken during list traversals in > luo_preserve_file() and luo_file_deserialize(). Write locks are taken > during registration and unregistration. > > Signed-off-by: Pasha Tatashin Reviewed-by: Pratyush Yadav (Google) [...] -- Regards, Pratyush Yadav