linux-kernel - [PATCH 3/3] exec: kill the unnecessary mm->def_flags setting in load_elf

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Date:	Fri, 31 Jan 2014 12:23:47 -0600
From:	Alex Thorlton <athorlton@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Thorlton <athorlton@....com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 3/3] exec: kill the unnecessary mm->def_flags setting in load_elf_binary()

load_elf_binary() sets current->mm->def_flags = def_flags and
def_flags is always zero. Not only this looks strange, this is
unnecessary because mm_init() has already set ->def_flags = 0.

Signed-off-by: Alex Thorlton <athorlton@....com>
Suggested-by: Oleg Nesterov <oleg@...hat.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org

---
 fs/binfmt_elf.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 67be295..d09bd9c 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -579,7 +579,6 @@ static int load_elf_binary(struct linux_binprm *bprm)
 	unsigned long start_code, end_code, start_data, end_data;
 	unsigned long reloc_func_desc __maybe_unused = 0;
 	int executable_stack = EXSTACK_DEFAULT;
-	unsigned long def_flags = 0;
 	struct pt_regs *regs = current_pt_regs();
 	struct {
 		struct elfhdr elf_ex;
@@ -719,9 +718,6 @@ static int load_elf_binary(struct linux_binprm *bprm)
 	if (retval)
 		goto out_free_dentry;
 
-	/* OK, This is the point of no return */
-	current->mm->def_flags = def_flags;
-
 	/* Do this immediately, since STACK_TOP as used in setup_arg_pages
 	   may depend on the personality.  */
 	SET_PERSONALITY(loc->elf_ex);
-- 
1.7.12.4

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