Re: Regression introduced by commit"lib/bitmap.c: speed up bitmap_find_free_region"

[Stephen Rothwell]

Hi Andrew,

On Fri, 31 May 2013 12:05:42 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Fri, 31 May 2013 12:15:10 +0530 Sachin Kamat <sachin.kamat@xxxxxxxxxx> wrote:
> 
> > 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@xxxxxxx>
> > 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.

I removed those 2 patches from the akpm tree in linux-next today as well.
-- 
Cheers,
Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx

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