linux-kernel - Regression introduced by commit "lib/bitmap.c: speed up bitmap_find_free

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Message-ID: <CAK9yfHyZH3DSg2ZLbPN2bjQppWZSMR+2hQE+OU76eqSJoWAWGA@mail.gmail.com>
Date:	Fri, 31 May 2013 12:15:10 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, chanho.min@....com,
	Kamil Debski <k.debski@...sung.com>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	Arun Kumar K <arun.kk@...sung.com>
Subject: Regression introduced by commit "lib/bitmap.c: speed up bitmap_find_free_region"

Hi,

While testing MFC decoder on Exynos machines, I encountered some
memory allocation errors due to failure of dma_alloc_coherent().
File: drivers/media/platform/s5p-mfc/s5p_mfc_ctrl.c Line: 38.

Git bisect pointed me to the following commit as the first bad commit
(linux-next tree of 20130531):

commit 3d5272d9b289cd0930b2ea9984406d757a72f4dd
Author: Chanho Min <chanho.min@....com>
Date:   Thu May 23 10:37:28 2013 +1000
    lib/bitmap.c: speed up bitmap_find_free_region

Reverting this (and the commit 197e1cf7
("ib-bitmapc-speed-up-bitmap_find_free_region-fix") ) fixes this
issue.

Looks like some regression has been introduced by the above patch?

---
With warm regards,
Sachin
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