On Mon, Mar 14, 2022 at 03:52:15PM +0100, Thomas Bogendoerfer wrote:
> On Wed, Mar 09, 2022 at 02:09:39PM -0800, Kees Cook wrote:
> > Unfortunately, Clang did not have support for "sp" as a global register
> > definition, and was crashing after the addition of current_stack_pointer.
> > This has been fixed in Clang 15, but earlier Clang versions need to
> > avoid this code, so add a versioned test and revert back to the
> > open-coded asm instances. Fixes Clang build error:
> >
> > fatal error: error in backend: Invalid register name global variable
> >
> > Fixes: 200ed341b864 ("mips: Implement "current_stack_pointer"")
> > Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> > Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> > Link: https://lore.kernel.org/lkml/YikTQRql+il3HbrK@dev-arch.thelio-3990X
> > Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> > Cc: Marc Zyngier <maz@xxxxxxxxxx>
> > Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> > Cc: Yanteng Si <siyanteng01@xxxxxxxxx>
> > Cc: linux-mips@xxxxxxxxxxxxxxx
> > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> > ---
> > v1: https://lore.kernel.org/lkml/20220309204537.390428-1-keescook@xxxxxxxxxxxx
> > v2: - adjust Clang version (Nathan)
> > ---
> > arch/mips/Kconfig | 2 +-
> > arch/mips/include/asm/thread_info.h | 2 ++
> > arch/mips/kernel/irq.c | 3 ++-
> > arch/mips/lib/uncached.c | 4 +++-
> > 4 files changed, 8 insertions(+), 3 deletions(-)
>
> applied to mips-next with the Clang version in the decscription fixed.
Excellent; thanks very much!
-Kees
--
Kees Cook
