[PATCH] compound page: no access_process_vm check

The PageCompound check before access_process_vm's set_page_dirty_lock is no
longer necessary, so remove it.  But leave the PageCompound checks in
bio_set_pages_dirty, dio_bio_complete and nfs_free_user_pages: at least some
of those were introduced as a little optimization on hugetlb pages.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 5f33cdb..d2cf144 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -242,8 +242,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
                if (write) {
                        copy_to_user_page(vma, page, addr,
                                          maddr + offset, buf, bytes);
-                       if (!PageCompound(page))
-                               set_page_dirty_lock(page);
+                       set_page_dirty_lock(page);
                } else {
                        copy_from_user_page(vma, page, addr,
                                            buf, maddr + offset, bytes);