[PATCH] resend, unneeded cli/sti in ret_from_intr path

[PATCH] resend, unneeded cli/sti in ret_from_intr path

[Oleg Nesterov]

i386/kernel/entry.S:resume_kernel: is used on return path
from do_IRQ() which leaves interrupts disabled. And we have
preempt_stop == cli in ret_from_exception: case, before
ret_from_intr. So this 'cli' is unneeded.

It is ok to enter schedule() with interrupts disabled, so
this 'sti' in preempt_schedule_irq() seems to be unneeded too.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 2.6.12-rc1/arch/i386/kernel/entry.S~CLI	2005-03-21 19:55:51.000000000 +0300
+++ 2.6.12-rc1/arch/i386/kernel/entry.S	2005-03-21 19:57:58.000000000 +0300
@@ -176,7 +176,6 @@ ENTRY(resume_userspace)
 
 #ifdef CONFIG_PREEMPT
 ENTRY(resume_kernel)
-	cli
 	cmpl $0,TI_preempt_count(%ebp)	# non-zero preempt_count ?
 	jnz restore_all
 need_resched:
--- 2.6.12-rc1/kernel/sched.c~CLI	2005-03-19 14:16:53.000000000 +0300
+++ 2.6.12-rc1/kernel/sched.c	2005-03-21 19:57:58.000000000 +0300
@@ -2851,7 +2851,6 @@ need_resched:
 	saved_lock_depth = task->lock_depth;
 	task->lock_depth = -1;
 #endif
-	local_irq_enable();
 	schedule();
 	local_irq_disable();
 #ifdef CONFIG_PREEMPT_BKL