[ARM] pass vma for flush_anon_page()

Since get_user_pages() may be used with processes other than the
current process and calls flush_anon_page(), flush_anon_page() has to
cope in some way with non-current processes.

It may not be appropriate, or even desirable to flush a region of
virtual memory cache in the current process when that is different to
the process that we want the flush to occur for.

Therefore, pass the vma into flush_anon_page() so that the architecture
can work out whether the 'vmaddr' is for the current process or not.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 6 insertions, 5 deletions

diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 73e794f0ff09..debf6813934a 100644
--- a/Documentation/cachetlb.txt
+++ b/Documentation/cachetlb.txt
@@ -373,14 +373,15 @@ 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)
+  void flush_anon_page(struct vm_area_struct *vma, 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.
+        the cache of the page at vmaddr.
 
   void flush_kernel_dcache_page(struct page *page)
         When the kernel needs to modify a user page is has obtained
diff --git a/include/asm-parisc/cacheflush.h b/include/asm-parisc/cacheflush.h
index aedb0512cb04..a799dd8ef395 100644
--- a/include/asm-parisc/cacheflush.h
+++ b/include/asm-parisc/cacheflush.h
@@ -186,7 +186,7 @@ flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long
 }
 
 static inline void
-flush_anon_page(struct page *page, unsigned long vmaddr)
+flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
 {
         if (PageAnon(page))
                 flush_user_dcache_page(vmaddr);
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index ca9a602cffd7..645d440807c2 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -8,7 +8,7 @@
 #include <asm/cacheflush.h>
 
 #ifndef ARCH_HAS_FLUSH_ANON_PAGE
-static inline void flush_anon_page(struct page *page, unsigned long vmaddr)
+static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
 {
 }
 #endif
diff --git a/mm/memory.c b/mm/memory.c
index 563792f4f687..af227d26e104 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1091,7 +1091,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                         if (pages) {
                                 pages[i] = page;
 
-                                flush_anon_page(page, start);
+                                flush_anon_page(vma, page, start);
                                 flush_dcache_page(page);
                         }
                         if (vmas)