| Message ID | 1252511536-22066-2-git-send-email-James.Bottomley@suse.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 211ff44..eb99c70 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -17,6 +17,12 @@ static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page static inline void flush_kernel_dcache_page(struct page *page) { } +static inline void flush_kernel_dcache_addr(void *vaddr) +{ +} +static inline void invalidate_kernel_dcache_addr(void *vaddr) +{ +} #endif #include <asm/kmap_types.h>
On Virtually Indexed architectures (which don't do automatic alias resolution in their caches), we have to flush via the correct virtual address to prepare pages for DMA. On some architectures (like arm) we cannot prevent the CPU from doing data movein along the alias (and thus giving stale read data), so we not only have to introduce a flush API to push dirty cache lines out, but also an invalidate API to kill inconsistent cache lines that may have moved in before DMA changed the data Signed-off-by: James Bottomley <James.Bottomley@suse.de> --- include/linux/highmem.h | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)