[PATCH] ARM: OMAP: DMA transfer parameter configuration fix

[linux-2.6-omap-h63xx.git] / Documentation / cachetlb.txt

diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 1f312a9893d91e7d2b57ebf729e1989d2aaf5fa8..53245c429f7d9f13999803ea4ced0813437fceb5 100644 (file)
--- 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.