linux-kernel - [tip:x86/cleanups] x86: Use kmemdup() in copy_thread(), rather than duplicating its implementation

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Date:	Mon, 5 Dec 2011 09:37:26 -0800
From:	tip-bot for Thomas Meyer <thomas@...3r.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, thomas@...3r.de, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/cleanups] x86: Use kmemdup() in copy_thread(), rather than duplicating its implementation

Commit-ID:  cced40229993bb63238299e48a22e4c8d1e13181
Gitweb:     http://git.kernel.org/tip/cced40229993bb63238299e48a22e4c8d1e13181
Author:     Thomas Meyer <thomas@...3r.de>
AuthorDate: Thu, 17 Nov 2011 23:43:40 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 5 Dec 2011 13:54:39 +0100

x86: Use kmemdup() in copy_thread(), rather than duplicating its implementation

The semantic patch that makes this change is available
in scripts/coccinelle/api/memdup.cocci.

Signed-off-by: Thomas Meyer <thomas@...3r.de>
Link: http://lkml.kernel.org/r/1321569820.1624.275.camel@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/process_64.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 3bd7e6e..d2c1f62 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -293,13 +293,12 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
 
 	if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
-		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
+		p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr,
+						  IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!p->thread.io_bitmap_ptr) {
 			p->thread.io_bitmap_max = 0;
 			return -ENOMEM;
 		}
-		memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr,
-				IO_BITMAP_BYTES);
 		set_tsk_thread_flag(p, TIF_IO_BITMAP);
 	}
 
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