From: Andrew Morton <akpm@linux-foundation.org>
To: Chintan Pandya <cpandya@codeaurora.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: BUG when __kmap_atomic_idx crosses boundary
Date: Wed, 30 Jul 2014 02:06:15 -0700 [thread overview]
Message-ID: <20140730020615.2f943cf7.akpm@linux-foundation.org> (raw)
In-Reply-To: <1406710355-4360-1-git-send-email-cpandya@codeaurora.org>
On Wed, 30 Jul 2014 14:22:35 +0530 Chintan Pandya <cpandya@codeaurora.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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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Chintan Pandya <cpandya@codeaurora.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: BUG when __kmap_atomic_idx crosses boundary
Date: Wed, 30 Jul 2014 02:06:15 -0700 [thread overview]
Message-ID: <20140730020615.2f943cf7.akpm@linux-foundation.org> (raw)
In-Reply-To: <1406710355-4360-1-git-send-email-cpandya@codeaurora.org>
On Wed, 30 Jul 2014 14:22:35 +0530 Chintan Pandya <cpandya@codeaurora.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.
next prev parent reply other threads:[~2014-07-30 9:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-30 8:52 [PATCH] mm: BUG when __kmap_atomic_idx crosses boundary Chintan Pandya
2014-07-30 8:52 ` Chintan Pandya
2014-07-30 9:06 ` Andrew Morton [this message]
2014-07-30 9:06 ` Andrew Morton
2014-07-30 10:37 ` Davidlohr Bueso
2014-07-30 10:37 ` Davidlohr Bueso
2014-07-30 10:52 ` Davidlohr Bueso
2014-07-30 10:52 ` Davidlohr Bueso
2014-07-31 5:36 ` Chintan Pandya
2014-07-31 5:36 ` Chintan Pandya
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