From: Hugh Dickins <hugh@veritas.com>
Date: Tue, 14 Feb 2006 21:52:59 +0000 (-0800)
Subject: [PATCH] compound page: no access_process_vm check
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=16bf134840da3920ded1290973c56ec214636f12;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

[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 5f33cdb6fff..d2cf144d0af 100644
--- 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);