Re: [PATCH] arm64/mm: Reject invalid NUMA option

Will Deacon
2020-04-28T07:25:25Z

On Tue, Apr 28, 2020 at 02:35:20PM +1000, Gavin Shan wrote:
> On 4/28/20 1:09 PM, Steven Rostedt wrote:
>
> [...]
>
> >
> > Could this be a bug in the implementation of strncmp() in
> > arch/arm64/lib/strncmp.S. As I don't know arm64 assembly, I have no idea
> > what it is trying to do.
> >
> > But strncmp("o","off",3) returning zero *is* a bug.
> >
>
> I think it's false alarm. The patch has been in my local repo for a while.
> I checked out 5.7.rc3 and tried passing "numa=o" to the kernel, @numa_off
> is unchanged and its value is false. I also check the return value from
> strncmp() as below, it's correct. Nothing is broken. I should have retested
> before posting it. Sorry for the noise. Please ignore the crap patch :)

Hmm, it's still worrying that you had that patch kicking around though, as
it sounds like it /used/ to be broken. Would you be able to test the LTS
kernels (5.4, 4.19, 4.14, 4.9, 4.4) to check that we're not missing a
backport, please? Sorry to be a pain, but I'd like to get to the bottom of
this!

Thanks,

Will