diff options
Diffstat (limited to 'arch/powerpc/include/asm/cacheflush.h')
| -rw-r--r-- | arch/powerpc/include/asm/cacheflush.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h index 11843e37d9cf9..0d72ec75da631 100644 --- a/arch/powerpc/include/asm/cacheflush.h +++ b/arch/powerpc/include/asm/cacheflush.h @@ -23,9 +23,21 @@ #define flush_cache_range(vma, start, end) do { } while (0) #define flush_cache_page(vma, vmaddr, pfn) do { } while (0) #define flush_icache_page(vma, page) do { } while (0) -#define flush_cache_vmap(start, end) do { } while (0) #define flush_cache_vunmap(start, end) do { } while (0) +#ifdef CONFIG_PPC_BOOK3S_64 +/* + * Book3s has no ptesync after setting a pte, so without this ptesync it's + * possible for a kernel virtual mapping access to return a spurious fault + * if it's accessed right after the pte is set. The page fault handler does + * not expect this type of fault. flush_cache_vmap is not exactly the right + * place to put this, but it seems to work well enough. + */ +#define flush_cache_vmap(start, end) do { asm volatile("ptesync" ::: "memory"); } while (0) +#else +#define flush_cache_vmap(start, end) do { } while (0) +#endif + #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 extern void flush_dcache_page(struct page *page); #define flush_dcache_mmap_lock(mapping) do { } while (0) |