linux-kernel - Re: [PATCH] mm: BUG when __kmap_atomic

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Message-Id: <20140730020615.2f943cf7.akpm@linux-foundation.org>
Date:	Wed, 30 Jul 2014 02:06:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chintan Pandya <cpandya@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: BUG when __kmap_atomic_idx crosses boundary

On Wed, 30 Jul 2014 14:22:35 +0530 Chintan Pandya <cpandya@...eaurora.org> wrote:

> __kmap_atomic_idx >= KM_TYPE_NR or < ZERO is a bug.
> Report it even if CONFIG_DEBUG_HIGHMEM is not enabled.
> That saves much debugging efforts.

Please take considerably more care when preparing patch changelogs.

kmap_atomic() is a very commonly called function so we'll need much
more detail than this to justify adding overhead to it.

I don't think CONFIG_DEBUG_HIGHMEM really needs to exist.  We could do
s/CONFIG_DEBUG_HIGHMEM/CONFIG_DEBUG_VM/g and perhaps your secret bug
whatever it was would have been found more easily.

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