[PATCH] x86-64: don't use set_irq_regs()

We don't need to setup _irq_regs in smp_xxx_interrupt (except apic timer).
These handlers run with irqs disabled and do not call functions which need
"struct pt_regs".

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>
Acked-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
index 31e5c6573aae450b3a1f94fe7129de94fc4ea26e..1b080ab8a49fad87d600b397d12748393d46ed6e 100644 (file)
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -321,7 +321,6 @@ static inline void leave_mm (unsigned long cpu)
 
 fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
 {
-       struct pt_regs *old_regs = set_irq_regs(regs);
        unsigned long cpu;
 
        cpu = get_cpu();
@@ -352,7 +351,6 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
        smp_mb__after_clear_bit();
 out:
        put_cpu_no_resched();
-       set_irq_regs(old_regs);
 }
 
 static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
@@ -607,14 +605,11 @@ void smp_send_stop(void)
  */
 fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
 {
-       struct pt_regs *old_regs = set_irq_regs(regs);
        ack_APIC_irq();
-       set_irq_regs(old_regs);
 }
 
 fastcall void smp_call_function_interrupt(struct pt_regs *regs)
 {
-       struct pt_regs *old_regs = set_irq_regs(regs);
        void (*func) (void *info) = call_data->func;
        void *info = call_data->info;
        int wait = call_data->wait;
@@ -637,7 +632,6 @@ fastcall void smp_call_function_interrupt(struct pt_regs *regs)
                mb();
                atomic_inc(&call_data->finished);
        }
-       set_irq_regs(old_regs);
 }
 
 /*