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author | Max Filippov <jcmvbkbc@gmail.com> | 2014-07-21 18:54:11 +0400 |
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committer | Max Filippov <jcmvbkbc@gmail.com> | 2014-08-14 11:59:20 +0400 |
commit | a91902db2990909ea5e6b110811b448f2e8f1571 (patch) | |
tree | 133c118a40292c1c4480acaaa1df1add1b70eaf0 /arch/xtensa/include/asm/cacheflush.h | |
parent | 7128039fe2dd3d59da9e4ffa036f3aaa3ba87b9f (diff) | |
download | linux-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.h | 2 |
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) { } |