[PATCH 2/2] add flush_kernel_dcache_page() API

[James Bottomley <James.Bottomley@SteelEye.com>]

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 <James.Bottomley@SteelEye.com>

Index: BUILD-2.6/Documentation/cachetlb.txt
===================================================================
--- BUILD-2.6.orig/Documentation/cachetlb.txt	2006-03-21 13:37:45.000000000 -0600
+++ BUILD-2.6/Documentation/cachetlb.txt	2006-03-21 13:37:54.000000000 -0600
@@ -371,6 +371,18 @@
 	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.
Index: BUILD-2.6/include/linux/highmem.h
===================================================================
--- BUILD-2.6.orig/include/linux/highmem.h	2006-03-21 13:37:19.000000000 -0600
+++ BUILD-2.6/include/linux/highmem.h	2006-03-21 13:37:54.000000000 -0600
@@ -13,6 +13,12 @@
 }
 #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>