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authorMax Filippov <jcmvbkbc@gmail.com>2014-07-21 18:54:11 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2014-08-14 11:59:20 +0400
commita91902db2990909ea5e6b110811b448f2e8f1571 (patch)
tree133c118a40292c1c4480acaaa1df1add1b70eaf0 /arch/xtensa/include/asm/cacheflush.h
parent7128039fe2dd3d59da9e4ffa036f3aaa3ba87b9f (diff)
downloadlinux-a91902db2990909ea5e6b110811b448f2e8f1571.tar.xz
xtensa: implement clear_user_highpage and copy_user_highpage
Existing clear_user_page and copy_user_page cannot be used with highmem because they calculate physical page address from its virtual address and do it incorrectly in case of high memory page mapped with kmap_atomic. Also kmap is not needed, as most likely userspace mapping color would be different from the kmapped color. Provide clear_user_highpage and copy_user_highpage functions that determine if temporary mapping is needed for the pages. Move most of the logic of the former clear_user_page and copy_user_page to xtensa/mm/cache.c only leaving temporary mapping setup, invalidation and clearing/copying in the xtensa/mm/misc.S. Rename these functions to clear_page_alias and copy_page_alias. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/cacheflush.h')
-rw-r--r--arch/xtensa/include/asm/cacheflush.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/cacheflush.h b/arch/xtensa/include/asm/cacheflush.h
index 555a98a18453..e72aaca7a77f 100644
--- a/arch/xtensa/include/asm/cacheflush.h
+++ b/arch/xtensa/include/asm/cacheflush.h
@@ -37,6 +37,7 @@
* specials for cache aliasing:
*
* __flush_invalidate_dcache_page_alias(vaddr,paddr)
+ * __invalidate_dcache_page_alias(vaddr,paddr)
* __invalidate_icache_page_alias(vaddr,paddr)
*/
@@ -62,6 +63,7 @@ extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
+extern void __invalidate_dcache_page_alias(unsigned long, unsigned long);
#else
static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,
unsigned long phys) { }