linux-hardening - Re: [PATCH] mm, page_alloc: use check_pages

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Date:   Wed, 5 Apr 2023 15:50:10 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org,
        Alexander Halbuer <halbuer@....uni-hannover.de>
Subject: Re: [PATCH] mm, page_alloc: use check_pages_enabled static key to
 check tail pages

On Wed, Apr 05, 2023 at 04:28:40PM +0200, Vlastimil Babka wrote:
> Commit 700d2e9a36b9 ("mm, page_alloc: reduce page alloc/free sanity
> checks") has introduced a new static key check_pages_enabled to control
> when struct pages are sanity checked during allocation and freeing. Mel
> Gorman suggested that free_tail_pages_check() could use this static key
> as well, instead of relying on CONFIG_DEBUG_VM. That makes sense, so do
> that. Also rename the function to free_tail_page_prepare() because it
> works on a single tail page and has a struct page preparation component
> as well as the optional checking component.
> Also remove some unnecessary unlikely() within static_branch_unlikely()
> statements that Mel pointed out for commit 700d2e9a36b9.
> 
> Suggested-by: Mel Gorman <mgorman@...hsingularity.net>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs