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Commit 250981e6 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86: reduce preemption off section in exit thread 



Impact: latency improvement

No need to keep preemption disabled over the kfree call.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 0f3fa48a

arch/x86/kernel/process.c

+3 −2
Original line number Diff line number Diff line
@@ -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);