| Message ID | e1c146e5d43e8b2605af6e1330167d8e18d36f44.1520965380.git.msuchanek@suse.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | powerpc barrier_nospec | expand |
On Tue, Mar 13, 2018 at 07:32:59PM +0100, Michal Suchanek wrote:
> Copypasta from original gmb() and rfi implementation
Actual real changelogs would be very welcome. Seeing as I've not seen
these mythical RFI patches, this leaves one quite puzzled :-)
diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index 10daa1d56e0a..8e47b3abe405 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -75,6 +75,15 @@ do { \ ___p1; \ }) +/* TODO: add patching so this can be disabled */ +/* Prevent speculative execution past this barrier. */ +#define barrier_nospec_asm ori 31,31,0 +#ifdef __ASSEMBLY__ +#define barrier_nospec barrier_nospec_asm +#else +#define barrier_nospec() __asm__ __volatile__ (stringify_in_c(barrier_nospec_asm) : : :) +#endif + #include <asm-generic/barrier.h> #endif /* _ASM_POWERPC_BARRIER_H */
Copypasta from original gmb() and rfi implementation Signed-off-by: Michal Suchanek <msuchanek@suse.de> --- arch/powerpc/include/asm/barrier.h | 9 +++++++++ 1 file changed, 9 insertions(+)