From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 26 Jul 2011 23:08:43 +0000 (-0700)
Subject: fs/exec.c:acct_arg_size(): ptl is no longer needed for add_mm_counter()
X-Git-Tag: v3.1-rc1~189
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32e107f71e4a993ac438f0049aa4019457911ffb;p=pandora-kernel.git

fs/exec.c:acct_arg_size(): ptl is no longer needed for add_mm_counter()

acct_arg_size() takes ->page_table_lock around add_mm_counter() if
!SPLIT_RSS_COUNTING.  This is not needed after commit 172703b08cd0 ("mm:
delete non-atomic mm counter implementation").

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/exec.c b/fs/exec.c
index 0e8e59939d09..da80612a35f4 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -181,14 +181,7 @@ static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
 		return;
 
 	bprm->vma_pages = pages;
-
-#ifdef SPLIT_RSS_COUNTING
-	add_mm_counter(mm, MM_ANONPAGES, diff);
-#else
-	spin_lock(&mm->page_table_lock);
 	add_mm_counter(mm, MM_ANONPAGES, diff);
-	spin_unlock(&mm->page_table_lock);
-#endif
 }
 
 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,