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SubjectRe: [PATCH Updated] PM/Freezer: Thaw only kernel threads if freezing of kernel threads fails
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On Saturday, February 04, 2012, Srivatsa S. Bhat wrote:
> On 02/02/2012 04:29 AM, Srivatsa S. Bhat wrote:
>
> >
> > From: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> > Subject: [PATCH] PM/Freezer: Thaw only kernel threads if freezing of kernel threads fails
> >
> > If freezing of kernel threads fails, we are expected to automatically thaw
> > tasks in the error recovery path. However, at times, we encounter situations
> > in which we would like the automatic error recovery path to thaw only the
> > kernel threads, because we want to be able to do some more cleanup before
> > we thaw userspace. Something like:
> >
> > error = freeze_kernel_threads();
> > if (error) {
> > /* Do some cleanup */
> >
> > /* Only then thaw userspace tasks*/
> > thaw_processes();
> > }
> >
> > An example of such a situation is where we freeze/thaw filesystems during
> > suspend/hibernation. There, if freezing of kernel threads fails, we would
> > like to thaw the frozen filesystems before thawing the userspace tasks.
> >
> > So, modify freeze_kernel_threads() to thaw only kernel threads in case of
> > freezing failure. And change suspend_freeze_processes() accordingly.
> > (At the same time, let us also get rid of the rather cryptic usage of the
> > conditional operator (:?) in that function.)
> >
> > Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> > Acked-by: Tejun Heo <tj@kernel.org>
> > ---
>
>
> Hi Rafael,
>
> I have reworked the changelog of this patch to indicate that this fixes a
> regression. Here is the updated patch:

Well, I've already fixed that up in my tree, but thanks anyway. :-)

Rafael


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