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-rw-r--r--Documentation/cachetlb.txt21
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 4ae418889b88..53245c429f7d 100644
--- a/Documentation/cachetlb.txt
+++ b/Documentation/cachetlb.txt
@@ -362,6 +362,27 @@ 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_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.