[PATCH v5.10] arm64: fix a concurrency issue in emulation_proc_handler()

[Ruan Jinjie]

On 2023/1/31 15:27, Greg KH wrote:
> On Tue, Jan 31, 2023 at 02:52:11PM +0800, ruanjinjie wrote:
>> This patch is addressing an issue in stable linux-5.10 only.
>>
>> In linux-6.1, the related code is refactored in 124c49b1b("arm64:
>> armv8_deprecated: rework deprected instruction handling") and
>> this issue was incidentally fixed. However, the patch changes a lot and
>> is not specific to this issue.
> 
> Then what about 5.15.y?  You can not upgrade to that kernel and have a
> regression, right?

This patch has a pre-dependency af483947d ("arm64: fix oops in
concurrently setting insn_emulation sysctls"), which has not merged into
branches except 5.10.y, so the other branches don't apply.

> 
> And nit, you need a ' ' before the '(' character.
> 
> But why can we just not take the original commit that fixed this issue?
> That way almost always is the best (prevents regressions, makes
> backports easier, is actually tested, etc.) ?

Thank you! It is ok to take the original commit to fix this issue.

> 
> thanks,
> 
> greg k-h