linux-kernel - Re: [PATCH v3] mm/memmap: Prevent double scanning of memmap by kmemleak

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Message-ID: <Z3umiX8dSge66tLj@arm.com>
Date: Mon, 6 Jan 2025 09:46:49 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Guo Weikang <guoweikang.kernel@...il.com>
Cc: Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm/memmap: Prevent double scanning of memmap by
 kmemleak

On Mon, Jan 06, 2025 at 10:11:25AM +0800, Guo Weikang wrote:
> kmemleak explicitly scans the mem_map through the valid struct page objects.
> However, memmap_alloc() was also adding this memory to the gray object list,
> causing it to be scanned twice. Removes memmap_alloc() from the
> scan list and adds a comment to clarify the behavior.
> 
> Link: https://lore.kernel.org/lkml/CAOm6qn=FVeTpH54wGDFMHuCOeYtvoTx30ktnv9-w3Nh8RMofEA@mail.gmail.com/
> 
> Signed-off-by: Guo Weikang <guoweikang.kernel@...il.com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>