X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=Documentation%2Fcachetlb.txt;h=53245c429f7d9f13999803ea4ced0813437fceb5;hb=1729dc7833014eaba3520091a673dbdc9242d9f9;hp=1f312a9893d91e7d2b57ebf729e1989d2aaf5fa8;hpb=03beb07664d768db97bf454ae5c9581cd4737bb4;p=safe%2Fjmp%2Flinux-2.6

diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 1f312a9..53245c4 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.