diff options
| -rw-r--r-- | Documentation/cachetlb.txt | 9 | ||||
| -rw-r--r-- | include/linux/highmem.h | 6 | ||||
| -rw-r--r-- | mm/memory.c | 2 |
3 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt index 4ae418889b881c..1f312a9893d91e 100644 --- a/Documentation/cachetlb.txt +++ b/Documentation/cachetlb.txt @@ -362,6 +362,15 @@ maps this page at its virtual address. likely that you will need to flush the instruction cache for copy_to_user_page(). + void flush_anon_page(struct page *page, unsigned long vmaddr) + When the kernel needs to access the contents of an anonymous + page, it calls this function (currently only + get_user_pages()). Note: flush_dcache_page() deliberately + doesn't work for an anonymous page. The default + implementation is a nop (and should remain so for all coherent + architectures). For incoherent architectures, it should flush + the cache of the page at vmaddr in the current user process. + 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 6bece9280eb779..7bd2593dbef9e5 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -7,6 +7,12 @@ #include <asm/cacheflush.h> +#ifndef ARCH_HAS_FLUSH_ANON_PAGE +static inline void flush_anon_page(struct page *page, unsigned long vmaddr) +{ +} +#endif + #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> diff --git a/mm/memory.c b/mm/memory.c index e347e106ca3ad4..67686048f09496 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1071,6 +1071,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, } if (pages) { pages[i] = page; + + flush_anon_page(page, start); flush_dcache_page(page); } if (vmas) |