From 5a3a5a98b6422d05c39eaa32c8b3f83840c7b768 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 26 Mar 2006 01:36:59 -0800 Subject: [PATCH] Add flush_kernel_dcache_page() API We have a problem in a lot of emulated storage in that it takes a page from get_user_pages() and does something like kmap_atomic(page) modify page kunmap_atomic(page) However, nothing has flushed the kernel cache view of the page before the kunmap. We need a lightweight API to do this, so this new API would specifically be for flushing the kernel cache view of a user page which the kernel has modified. The driver would need to add flush_kernel_dcache_page(page) before the final kunmap. Signed-off-by: James Bottomley Cc: Russell King Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/cachetlb.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'Documentation/cachetlb.txt') diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt index 1f312a9893d..53245c429f7 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. -- cgit v1.2.3