diff options
| author |   John David Anglin <dave.anglin@bell.net> | 2019-04-21 19:47:17 -0400 |
|---|---|---|
| committer |   Helge Deller <deller@gmx.de> | 2019-05-03 23:47:40 +0200 |
| commit | 44224bdb99150ad17cf394973b25736cb92c246a (patch) | |
| tree | 68f2e534928afaa3ca2ca42943bf00e24fbe9ac5 | |
| parent | parisc: Use ldcw instruction for SMP spinlock release barrier (diff) | |
| download | linux-dev-44224bdb99150ad17cf394973b25736cb92c246a.tar.xz linux-dev-44224bdb99150ad17cf394973b25736cb92c246a.zip | |
parisc: Add memory clobber to TLB purges
The pdtlb and pitlb instructions are strongly ordered. The asms invoking
these instructions should be compiler memory barriers to ensure the
compiler doesn't reorder memory operations around these instructions.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
CC: stable@vger.kernel.org # v4.20+
Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure")
Signed-off-by: Helge Deller <deller@gmx.de>
| -rw-r--r-- | arch/parisc/include/asm/cache.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/cache.h b/arch/parisc/include/asm/cache.h index 006fb939cac8..c18351cf5876 100644 --- a/arch/parisc/include/asm/cache.h +++ b/arch/parisc/include/asm/cache.h @@ -44,14 +44,14 @@ void parisc_setup_cache_timing(void); #define pdtlb(addr) asm volatile("pdtlb 0(%%sr1,%0)" \ ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \ - : : "r" (addr)) + : : "r" (addr) : "memory") #define pitlb(addr) asm volatile("pitlb 0(%%sr1,%0)" \ ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \ ALTERNATIVE(ALT_COND_NO_SPLIT_TLB, INSN_NOP) \ - : : "r" (addr)) + : : "r" (addr) : "memory") #define pdtlb_kernel(addr) asm volatile("pdtlb 0(%0)" \ ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \ - : : "r" (addr)) + : : "r" (addr) : "memory") #define asm_io_fdc(addr) asm volatile("fdc %%r0(%0)" \ ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \ |