diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-09-02 19:57:33 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-09-02 14:51:17 -0700 |
| commit | 6f46b3aef0031c08a7b439d63013dad2aeb093b2 (patch) | |
| tree | 939cceda0d84c419d3ee35f6c2625734a4218be2 | |
| parent | dc56c0f9b870fba7a4eef2bb463db6881284152b (diff) | |
| download | tip-6f46b3aef0031c08a7b439d63013dad2aeb093b2.tar.gz | |
x86: copy_thread: Don't nullify ->ptrace_bps twicex86/fpu
Both 32bit and 64bit versions of copy_thread() do memset(ptrace_bps)
twice for no reason, kill the 2nd memset().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/20140902175733.GA21676@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| -rw-r--r-- | arch/x86/kernel/process_32.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/process_64.c | 2 |
2 files changed, 1 insertions, 5 deletions
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index c73b3c1a582b0..8f3ebfe710d07 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -138,6 +138,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, p->thread.sp = (unsigned long) childregs; p->thread.sp0 = (unsigned long) (childregs+1); + memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); if (unlikely(p->flags & PF_KTHREAD)) { /* kernel thread */ @@ -153,7 +154,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, childregs->cs = __KERNEL_CS | get_kernel_rpl(); childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_FIXED; p->thread.io_bitmap_ptr = NULL; - memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); return 0; } *childregs = *current_pt_regs(); @@ -168,8 +168,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, tsk = current; err = -ENOMEM; - memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); - if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) { p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr, IO_BITMAP_BYTES, GFP_KERNEL); diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 593257def7769..3ed4a68d4013f 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -192,8 +192,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, childregs->sp = sp; err = -ENOMEM; - 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 = kmemdup(me->thread.io_bitmap_ptr, IO_BITMAP_BYTES, GFP_KERNEL); |