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b=L+AeWokGRrLG6FzvYhX1dd2PA2f/c986Hsq8WdFarRpaZq0uIz7pqJBAJdp4piuCF XxK/IxC7RpG4QcYQMJiy3/yRVz5s1BJHrYr5oz3oYBe/WL+T0mz5/b9iWS+9RHTUXq JTrnqp8zBURLH1gayPrKaoob2j6eDa50eJLfZW/bbAfx647yS9jBLMT6g4rb6jiHz9 +wK/qlrbbdwRFYeCmWdikLjRq4W4dD3ndh1L3nH+lT6EMXO5lZ7nZCcknj6oNFRxpV yWR/qu/D2RJcXB1Up1CZw5HSNHbgR3zuWVuT8W7aazSHyetgwmk+nFTJr1nTfhVFOQ SApD8hPIfaX3g== Date: Wed, 15 Apr 2026 18:26:37 +0300 From: Mike Rapoport To: Pasha Tatashin Cc: 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 v4 04/11] liveupdate: Protect FLB lists with luo_register_rwlock Message-ID: References: <20260413185127.128180-1-pasha.tatashin@soleen.com> <20260413185127.128180-5-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260413185127.128180-5-pasha.tatashin@soleen.com> X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 3D1981A0011 X-Stat-Signature: mi7h4x5ta9zem4gc83ww7u4cjuer5fuq X-HE-Tag: 1776266803-198305 X-HE-Meta: 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 9Fu24OmK yoYSLhqfQeGMq7AG3EO2r8xuMQUbXuO74SmiRaGLQ9pD+gP3UrzcMdF7EhG9+KYUEfVxVowkzFBlAPVFi8nekjIvx3rN7ZkYdUjr+eTaIlsQUKWmGnY1TN3C9FeOuLNNwHIHPltieijyTB5K7gd3PnOjxZB+SrWzJiqdqkqaAJxZUCm0UFd0FbwdVZE0ILROuvYlQWgRPbIY8ILaWMx+se7SNeDoqOkTtiTdwDZZhrncc9MjtHuXjCuPBB2nLz1VdeLbJEbBC8a8DSvo7JOQ2Nuc/zQnyZP6gb0n+M+uAc81KWURurAlSY9q74OqxJQ5rJVBbAceKNkH2BcPgxytwo477JN+ySqwKkyu8SS+YpZabyWXeJo9PSxNTd8XlocIizAYy Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Apr 13, 2026 at 06:51:20PM +0000, Pasha Tatashin wrote: > Because liveupdate FLB objects will soon drop their persistent module > references when registered, list traversals must be protected against > concurrent module unloading. > > To provide this protection, utilize the global luo_register_rwlock. > It protects the global registry of FLBs and the handler's specific > list of FLB dependencies. > > Read locks are used during concurrent list traversals (e.g., during > preservation and serialization). Write locks are taken during registration > and unregistration. > > Signed-off-by: Pasha Tatashin > Reviewed-by: Pratyush Yadav (Google) Reviewed-by: Mike Rapoport (Microsoft) > --- > include/linux/liveupdate.h | 1 + > kernel/liveupdate/luo_flb.c | 14 ++++++++++++++ > 2 files changed, 15 insertions(+) -- Sincerely yours, Mike.