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

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Date:	Fri, 31 May 2013 12:05:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, chanho.min@....com,
	Kamil Debski <k.debski@...sung.com>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	Arun Kumar K <arun.kk@...sung.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: Regression introduced by commit
 "lib/bitmap.c: speed up bitmap_find_free_region"

On Fri, 31 May 2013 12:15:10 +0530 Sachin Kamat <sachin.kamat@...aro.org> wrote:

> 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?

Thanks.  I dropped the patches for now, to minimise linux-next
breakage.  Hopefully we'll be able to identify and fix this at a later
time.

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