* 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
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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
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