linux-kernel - [PATCH 4/4] exec: kill the unnecessary mm->def_flags setting in load_elf

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Message-Id: <daed0ccdee74e3d8e2074e5c9128d0fedb0f4174.1393516106.git.athorlton@sgi.com>
Date:	Thu, 27 Feb 2014 11:23:26 -0600
From:	Alex Thorlton <athorlton@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Thorlton <athorlton@....com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexander Viro <viro@...iv.linux.org.uk>, linux390@...ibm.com,
	linux-s390@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org
Subject: [PATCH 4/4] 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: Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Rik van Riel <riel@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux390@...ibm.com
Cc: linux-s390@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: linux-api@...r.kernel.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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