linux-kernel - Re: [PATCH] mm/slub: Add a dump_stack() to the unexpected GFP check

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Message-ID: <20170116095522.lrqcoqktozvoeaql@pd.tnic>
Date:   Mon, 16 Jan 2017 10:55:22 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Michal Hocko <mhocko@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: Add a dump_stack() to the unexpected GFP check

On Mon, Jan 16, 2017 at 11:48:51AM +0200, Leon Romanovsky wrote:
> Almost, except one point - pr_warn and dump_stack have different log

Actually, Michal pointed out on IRC a more relevant difference:

WARN() taints the kernel and we don't want that for GFP flags misuse.
Also, from looking at __warn(), it checks panic_on_warn and we explode
if set.

So no, we probably don't want WARN() here.

-- 
Regards/Gruss,
    Boris.

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