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@m3y3r.de>
Link: http://lkml.kernel.org/r/1321569820.1624.275.camel@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 3bd7e6eebf31..d2c1f6208d62 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);
         }