linux-kernel - [tip:x86/fpu] x86, fpu: Shift "fpu_counter = 0" from copy_thread( ) to arch_dup_task

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Date:	Tue, 2 Sep 2014 15:19:44 -0700
From:	tip-bot for Oleg Nesterov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	sbsiddha@...il.com, oleg@...hat.com, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: [tip:x86/fpu] x86, fpu: Shift "fpu_counter = 0" from copy_thread(
 ) to arch_dup_task_struct()

Commit-ID:  dc56c0f9b870fba7a4eef2bb463db6881284152b
Gitweb:     http://git.kernel.org/tip/dc56c0f9b870fba7a4eef2bb463db6881284152b
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Tue, 2 Sep 2014 19:57:30 +0200
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Tue, 2 Sep 2014 14:51:16 -0700

x86, fpu: Shift "fpu_counter = 0" from copy_thread() to arch_dup_task_struct()

Cosmetic, but I think thread.fpu_counter should be initialized in
arch_dup_task_struct() too, along with other "fpu" variables. And
probably it make sense to turn it into thread.fpu->counter.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Link: http://lkml.kernel.org/r/20140902175730.GA21669@redhat.com
Reviewed-by: Suresh Siddha <sbsiddha@...il.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/process.c    | 1 +
 arch/x86/kernel/process_32.c | 2 --
 arch/x86/kernel/process_64.c | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index a44268c..e127dda 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -66,6 +66,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
 	*dst = *src;
 
+	dst->thread.fpu_counter = 0;
 	dst->thread.fpu.has_fpu = 0;
 	dst->thread.fpu.last_cpu = ~0;
 	dst->thread.fpu.state = NULL;
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 7bc86bb..c73b3c1 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -152,7 +152,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 		childregs->orig_ax = -1;
 		childregs->cs = __KERNEL_CS | get_kernel_rpl();
 		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
-		p->thread.fpu_counter = 0;
 		p->thread.io_bitmap_ptr = NULL;
 		memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
 		return 0;
@@ -165,7 +164,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	p->thread.ip = (unsigned long) ret_from_fork;
 	task_user_gs(p) = get_user_gs(current_pt_regs());
 
-	p->thread.fpu_counter = 0;
 	p->thread.io_bitmap_ptr = NULL;
 	tsk = current;
 	err = -ENOMEM;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index ca5b02d..593257d 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -163,7 +163,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	p->thread.sp = (unsigned long) childregs;
 	p->thread.usersp = me->thread.usersp;
 	set_tsk_thread_flag(p, TIF_FORK);
-	p->thread.fpu_counter = 0;
 	p->thread.io_bitmap_ptr = NULL;
 
 	savesegment(gs, p->thread.gsindex);
--
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