From: Helge Deller deller@gmx.de
commit 2d94a832e246ac00fd32eec241e6f1aa6fbc5700 upstream.
Add compiler memory barriers to ensure the compiler doesn't reorder memory operations around these instructions.
Cc: stable@vger.kernel.org # v4.20+ Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure") Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/parisc/include/asm/cache.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/parisc/include/asm/cache.h +++ b/arch/parisc/include/asm/cache.h @@ -56,10 +56,10 @@ void parisc_setup_cache_timing(void); #define asm_io_fdc(addr) asm volatile("fdc %%r0(%0)" \ ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \ ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) \ - : : "r" (addr)) + : : "r" (addr) : "memory") #define asm_io_sync() asm volatile("sync" \ ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \ - ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :: ) + ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :::"memory")
#endif /* ! __ASSEMBLY__ */