[kernel] powerpc/debug: Add missing warn flag to WARN_ON's non-builtin path

[Michael Ellerman]

On Wed, 2017-06-14 at 03:01:25 UTC, Alexey Kardashevskiy wrote:
> When trapped on WARN_ON(), report_bug() is expected to return
> BUG_TRAP_TYPE_WARN so the caller could increment NIP by 4 and continue.
> The __builtin_constant_p() path of the PPC's WARN_ON() calls (indirectly)
> __WARN_FLAGS() which has BUGFLAG_WARNING set, however the other branch
> does not which makes report_bug() report a bug rather than a warning.
> 
> Fixes: f26dee15103f ("debug: Avoid setting BUGFLAG_WARNING twice")
> Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a093c92dc7f96a15de98ec8cfe38e6

cheers