diff options
| -rw-r--r-- | Documentation/cachetlb.txt | 12 | ||||
| -rw-r--r-- | include/linux/highmem.h | 6 |
2 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt index 1f312a9893d9..53245c429f7d 100644 --- a/Documentation/cachetlb.txt +++ b/Documentation/cachetlb.txt @@ -371,6 +371,18 @@ maps this page at its virtual address. architectures). For incoherent architectures, it should flush the cache of the page at vmaddr in the current user process. + void flush_kernel_dcache_page(struct page *page) + When the kernel needs to modify a user page is has obtained + with kmap, it calls this function after all modifications are + complete (but before kunmapping it) to bring the underlying + page up to date. It is assumed here that the user has no + incoherent cached copies (i.e. the original page was obtained + from a mechanism like get_user_pages()). The default + implementation is a nop and should remain so on all coherent + architectures. On incoherent architectures, this should flush + the kernel cache for page (using page_address(page)). + + void flush_icache_range(unsigned long start, unsigned long end) When the kernel stores into addresses that it will execute out of (eg when loading modules), this function is called. diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 7bd2593dbef9..892c4ea1b425 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -13,6 +13,12 @@ static inline void flush_anon_page(struct page *page, unsigned long vmaddr) } #endif +#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE +static inline void flush_kernel_dcache_page(struct page *page) +{ +} +#endif + #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> |