From: Andrew Morton <akpm@osdl.org>
Date: Fri, 6 Oct 2006 20:28:09 +0000 (-0700)
Subject: [PATCH] x86_64 irq_regs fix
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d150ad7bd946f066c98a9725685109dcffae0cba;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] x86_64 irq_regs fix

smp_apic_timer_interrupt() needs to stack the pt_regs* for profile_tick.

If any other of those APIC interrupt handlers want to run get_irq_regs() then
their C entrypoint handlers will need the same treatment.

Cc: Andi Kleen <ak@muc.de>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Acked-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index af4a1c71a80d..4d9d5ed942b2 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -913,8 +913,10 @@ void smp_local_timer_interrupt(void)
  * [ if a single-CPU system runs an SMP kernel then we call the local
  *   interrupt as well. Thus we cannot inline the local irq ... ]
  */
-void smp_apic_timer_interrupt(void)
+void smp_apic_timer_interrupt(struct pt_regs *regs)
 {
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
 	/*
 	 * the NMI deadlock-detector uses this.
 	 */
@@ -934,6 +936,7 @@ void smp_apic_timer_interrupt(void)
 	irq_enter();
 	smp_local_timer_interrupt();
 	irq_exit();
+	set_irq_regs(old_regs);
 }
 
 /*