[PATCH] arm: cacheflush: get rid of restarting block

On 27/11/14 10:43, Vladimir Murzin wrote:

On 27/11/14 10:03, Will Deacon wrote:

quoted

On Thu, Nov 27, 2014 at 04:02:24AM +0000, Chanho Min wrote:

quoted

quoted

-----Original Message-----
From: Vladimir Murzin [mailto:vladimir.murzin at arm.com]
Sent: Wednesday, November 26, 2014 12:19 AM
To: linux-arm-kernel at lists.infradead.org; linux at arm.linux.org.uk
Cc: chanho.min at lge.com; will.deacon at arm.com; stable at vger.kernel.org
Subject: [PATCH] arm: cacheflush: get rid of restarting block

We cannot restart cacheflush safely if a process provides user-defined
signal handler and signal is pending. In this case -EINTR is returned
and it is expected that process re-invokes syscall. However, there are
a few problems with that:
 * looks like nobody bothers checking return value from cacheflush
 * but if it did, we don't provide the restart address for that, so the
   process has to use the same range again
 * ...and again, what might lead to looping forever

So, remove cacheflush restarting code and terminate cache flushing
as early as fatal signal is pending.

Cc: stable at vger.kernel.org # 3.12+
Reported-by: Chanho Min <chanho.min@lge.com>
Signed-off-by: Vladimir Murzin <redacted>
Acked-by: Will Deacon <redacted>
---
Hi,

There is my proposal for the problem reported in [1]. Since that
thread has not been progressing much, I'm addressing the problem in
separate patch.

Comments?

Thanks, We hope this to be applied.

Ok, good. In which case, can you put it into the patch system please,
Vladimir?

Already in patch system as 8226/1.

Vladimir

Sorry for banner - I should have checked that I use proper smtp server :(

Vladimir

quoted

Will

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