Re: [PATCH 3.9-stable 1/4] sched: Lower chances of cputime scaling overflow

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On Thu, May 09, 2013 at 11:02:24AM +0800, Lingzhu Xiang wrote:
> On 05/09/2013 06:54 AM, Greg KH wrote:
> >On Mon, May 06, 2013 at 02:27:11PM +0800, Lingzhu Xiang wrote:
> >>commit d9a3c9823a2e6a543eb7807fb3d15d8233817ec5 upstream.
> >>
> >>Backported for 3.9-stable. Minor context adjustment.
> >
> >You forgot to fix the build error that this patch causes, which makes me
> >think you didn't build it:
> >	kernel/sched/cputime.c: In function ‘scale_stime’:
> >	kernel/sched/cputime.c:539:3: error: implicit declaration of function ‘div64_u64_rem’ [-Werror=implicit-function-declaration]
> >
> >I've dropped all 4 of these from my queue, please fix up, and test,
> >before resending them.
> 
> I did build the patch series on x86_64 and i386. I suppose you built
> with only the first patch applied?
> 
> Indeed the first patch,
> 
> sched: Lower chances of cputime scaling overflow
> 
> adds the undefined div64_u64_rem, which is promptly reverted in the
> second patch,
> 
> sched: Avoid cputime scaling overflow

Is it broken this way in Linus's tree?

> I avoided to do major surgery on the two patches just to remove the
> reverting. The three more patches are pulled in here because the
> originally failed patch semantically depends on the three and they
> are actually worthy bug fixes which look like missed the 3.9
> release.
> 
> Please tell me what you think.

I think we need to get the author's of the patch, and the maintainers
involved, to agree that this all needs to be in the 3.9-stable tree.

thanks,

greg k-h
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