linux-kernel - Re: [PATCH] mm/kmemleak: Prevent soft lockup in kmemleak

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Message-ID: <Y1vgUBjb4xBNrrq0@arm.com>
Date:   Fri, 28 Oct 2022 14:59:44 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Waiman Long <longman@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH] mm/kmemleak: Prevent soft lockup in kmemleak_scan()'s
 object iteration loops

On Thu, Oct 20, 2022 at 01:56:19PM -0400, Waiman Long wrote:
> Commit 6edda04ccc7c ("mm/kmemleak: prevent soft lockup in first object
> iteration loop of kmemleak_scan()") adds cond_resched() in the first
> object iteration loop of kmemleak_scan(). However, it turns that the
> 2nd objection iteration loop can still cause soft lockup to happen in
> some cases. So add a cond_resched() call in the 2nd and 3rd loops as
> well to prevent that and for completeness.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

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