Commit-ID: 250981e6e1ef04947eccaa55e8c25ddcaa47a02e
Gitweb: http://git.kernel.org/tip/250981e6e1ef04947eccaa55e8c25ddcaa47a02e
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Mon, 16 Mar 2009 13:07:21 +0100
Commit: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 16 Mar 2009 15:32:28 +0100
x86: reduce preemption off section in exit thread
Impact: latency improvement
No need to keep preemption disabled over the kfree call.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/kernel/process.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 6afa523..156f875 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -65,11 +65,11 @@ void exit_thread(void)
{
struct task_struct *me = current;
struct thread_struct *t = &me->thread;
+ unsigned long *bp = t->io_bitmap_ptr;
- if (me->thread.io_bitmap_ptr) {
+ if (bp) {
struct tss_struct *tss = &per_cpu(init_tss, get_cpu());
- kfree(t->io_bitmap_ptr);
t->io_bitmap_ptr = NULL;
clear_thread_flag(TIF_IO_BITMAP);
/*
@@ -78,6 +78,7 @@ void exit_thread(void)
memset(tss->io_bitmap, 0xff, t->io_bitmap_max);
t->io_bitmap_max = 0;
put_cpu();
+ kfree(bp);
}
ds_exit_thread(current);
--
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