On Tue, 2 Apr 2024 at 10:19, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> On Mon, Apr 1, 2024, at 17:43, Greg Kroah-Hartman wrote:
> > 6.8-stable review patch. If anyone has any objections, please let me know.
>
> I think we should not backport the feature removal, this was
> intentionally done separately from the bugfix in 303d6da167dc
> ("ARM: iwmmxt: Use undef hook to enable coprocessor for task")
> that is indeed needed in stable kernels.
>
303d6da167dc is not a bugfix - it moves the undef handling into C code
for PJ4 but only for ARM not Thumb.
Subsequently, 8bcba70cb5c22 removed the Thumb exception handling,
leading to the regression.
So without this fix, the Thumb case remains broken unless iwmmxt
support is disabled in Kconfig.
> It still makes sense for everyone to just turn iwmmxt support
> off on pj4.
>
If that is deemed sufficient for stable kernels, then we can drop this
backport. Otherwise, we need to do something else if this patch is not
suitable for -stable
