diff options
Diffstat (limited to 'drivers/gpu/drm/drm_cache.c')
| -rw-r--r-- | drivers/gpu/drm/drm_cache.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index bb8f58012189..534cb89b160d 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -32,6 +32,12 @@ #include <drm/drmP.h> #if defined(CONFIG_X86) + +/* + * clflushopt is an unordered instruction which needs fencing with mfence or + * sfence to avoid ordering issues. For drm_clflush_page this fencing happens + * in the caller. + */ static void drm_clflush_page(struct page *page) { @@ -44,7 +50,7 @@ drm_clflush_page(struct page *page) page_virtual = kmap_atomic(page); for (i = 0; i < PAGE_SIZE; i += size) - clflush(page_virtual + i); + clflushopt(page_virtual + i); kunmap_atomic(page_virtual); } @@ -133,7 +139,7 @@ drm_clflush_virt_range(char *addr, unsigned long length) mb(); for (; addr < end; addr += boot_cpu_data.x86_clflush_size) clflush(addr); - clflush(end - 1); + clflushopt(end - 1); mb(); return; } |