From: tip-bot for Oleg Nesterov <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
oleg@redhat.com, tglx@linutronix.de, hpa@linux.intel.com
Subject: [tip:x86/fpu] x86: copy_thread: Don't nullify ->ptrace_bps twice
Date: Tue, 2 Sep 2014 15:19:57 -0700 [thread overview]
Message-ID: <tip-6f46b3aef0031c08a7b439d63013dad2aeb093b2@git.kernel.org> (raw)
In-Reply-To: <20140902175733.GA21676@redhat.com>
Commit-ID: 6f46b3aef0031c08a7b439d63013dad2aeb093b2
Gitweb: http://git.kernel.org/tip/6f46b3aef0031c08a7b439d63013dad2aeb093b2
Author: Oleg Nesterov <oleg@redhat.com>
AuthorDate: Tue, 2 Sep 2014 19:57:33 +0200
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 2 Sep 2014 14:51:17 -0700
x86: copy_thread: Don't nullify ->ptrace_bps twice
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>
---
arch/x86/kernel/process_32.c | 4 +---
arch/x86/kernel/process_64.c | 2 --
2 files changed, 1 insertion(+), 5 deletions(-)
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index c73b3c1..8f3ebfe 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 593257d..3ed4a68 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);
prev parent reply other threads:[~2014-09-02 22:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-02 17:56 [PATCH 0/7] x86, fpu: misc fixes/cleanups, more to come Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 1/7] x86, fpu: shift drop_init_fpu() from save_xstate_sig() to handle_signal() Oleg Nesterov
2014-09-02 22:18 ` [tip:x86/fpu] " tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 2/7] x86, fpu: __restore_xstate_sig()->math_state_restore() needs preempt_disable() Oleg Nesterov
2014-09-02 22:18 ` [tip:x86/fpu] x86, fpu: __restore_xstate_sig()-> math_state_restore() " tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 3/7] x86, fpu: change __thread_fpu_begin() to use use_eager_fpu() Oleg Nesterov
2014-09-02 22:19 ` [tip:x86/fpu] x86, fpu: Change " tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 4/7] x86, fpu: copy_process: avoid fpu_alloc/copy if !used_math() Oleg Nesterov
2014-09-02 22:19 ` [tip:x86/fpu] x86, fpu: copy_process: Avoid fpu_alloc/ copy " tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 5/7] x86, fpu: copy_process: sanitize fpu->last_cpu initialization Oleg Nesterov
2014-09-02 22:19 ` [tip:x86/fpu] x86, fpu: copy_process: Sanitize fpu-> last_cpu initialization tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 6/7] x86, fpu: shift "fpu_counter = 0" from copy_thread() to arch_dup_task_struct() Oleg Nesterov
2014-09-02 22:19 ` [tip:x86/fpu] x86, fpu: Shift "fpu_counter = 0" from copy_thread( ) " tip-bot for Oleg Nesterov
2014-09-02 17:57 ` [PATCH v2 7/7] x86: copy_thread: don't nullify ->ptrace_bps twice Oleg Nesterov
2014-09-02 22:19 ` tip-bot for Oleg Nesterov [this message]
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