4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen

mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed

* 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen
@ 2017-04-28 18:57 Vineet Gupta
  2017-04-30 14:08 ` Greg KH
  0 siblings, 1 reply; 2+ messages in thread
From: Vineet Gupta @ 2017-04-28 18:57 UTC (permalink / raw)
  To: stable; +Cc: lkml, arcml

Hi,

Can we please backport upstream ecd43afdbe72017aefe48080631eb625e177ef4d ("ARCv2:
save r30 on kernel entry as gcc uses it for code-gen") to 4.2 to 4.9 kernels.

While the issue cites gcc, it is general deficiency of kernel as userspace
programs can modify r30 register in hand/inline assembly and those will not be
preserved without this change.

Thx,
-Vineet

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen
  2017-04-28 18:57 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen Vineet Gupta
@ 2017-04-30 14:08 ` Greg KH
  0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2017-04-30 14:08 UTC (permalink / raw)
  To: Vineet Gupta; +Cc: stable, lkml, arcml

On Fri, Apr 28, 2017 at 11:57:36AM -0700, Vineet Gupta wrote:
> Hi,
> 
> Can we please backport upstream ecd43afdbe72017aefe48080631eb625e177ef4d ("ARCv2:
> save r30 on kernel entry as gcc uses it for code-gen") to 4.2 to 4.9 kernels.
> 
> While the issue cites gcc, it is general deficiency of kernel as userspace
> programs can modify r30 register in hand/inline assembly and those will not be
> preserved without this change.

Queued up for 4.9 and 4.4 stable trees, thanks.

greg k-h

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2017-04-30 14:12 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-04-28 18:57 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen Vineet Gupta
2017-04-30 14:08 ` Greg KH

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox

Powered by JetHome