linux-kernel - Re: [PATCH] mm: mempolicy: use VM_BUG_ON_VMA in queue_pages_test

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Date:   Mon, 27 Jan 2020 13:17:18 -0500
From:   Qian Cai <cai@....pw>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: mempolicy: use VM_BUG_ON_VMA in queue_pages_test_walk()



> On Jan 15, 2020, at 1:09 AM, Yang Shi <yang.shi@...ux.alibaba.com> wrote:
> 
> The VM_BUG_ON() is already used by queue_pages_test_walk(), it sounds
> better to dump more debug information by using VM_BUG_ON_VMA() to help
> debugging.

What’s the problem this is trying to resolve? Was there an existing bug would trigger this?