Revert "x86: fix NMI watchdog & 'stopped time' problem"

This reverts commit d4d25deca49ec2527a634557bf5a6cf449f85deb.

It tried to fix long standing bugzilla entries, but the solution was
reported to break other systems. The reporter of

http://bugzilla.kernel.org/show_bug.cgi?id=9791

tracked it down to this commit and confirmed that reverting the patch
restores the correct behaviour. It's too late in the release cycle to
find a better solution than reverting the commit to avoid regressions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index c3a565b..a6b1490 100644 (file)
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -2169,14 +2169,10 @@ static inline void __init check_timer(void)
 {
        int apic1, pin1, apic2, pin2;
        int vector;
-       unsigned int ver;
        unsigned long flags;
 
        local_irq_save(flags);
 
-       ver = apic_read(APIC_LVR);
-       ver = GET_APIC_VERSION(ver);
-
        /*
         * get/set the timer IRQ vector:
         */
@@ -2189,15 +2185,11 @@ static inline void __init check_timer(void)
         * mode for the 8259A whenever interrupts are routed
         * through I/O APICs.  Also IRQ0 has to be enabled in
         * the 8259A which implies the virtual wire has to be
-        * disabled in the local APIC.  Finally timer interrupts
-        * need to be acknowledged manually in the 8259A for
-        * timer_interrupt() and for the i82489DX when using
-        * the NMI watchdog.
+        * disabled in the local APIC.
         */
        apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
        init_8259A(1);
-       timer_ack = !cpu_has_tsc;
-       timer_ack |= (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
+       timer_ack = 1;
        if (timer_over_8254 > 0)
                enable_8259A_irq(0);
 

diff --git a/arch/x86/kernel/nmi_32.c b/arch/x86/kernel/nmi_32.c
index 80ca72e..852db29 100644 (file)
--- a/arch/x86/kernel/nmi_32.c
+++ b/arch/x86/kernel/nmi_32.c
@@ -25,7 +25,6 @@
 
 #include <asm/smp.h>
 #include <asm/nmi.h>
-#include <asm/timer.h>
 
 #include "mach_traps.h"
 
@@ -84,7 +83,7 @@ static int __init check_nmi_watchdog(void)
 
        prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
        if (!prev_nmi_count)
-               goto error;
+               return -1;
 
        printk(KERN_INFO "Testing NMI watchdog ... ");
 
@@ -119,7 +118,7 @@ static int __init check_nmi_watchdog(void)
        if (!atomic_read(&nmi_active)) {
                kfree(prev_nmi_count);
                atomic_set(&nmi_active, -1);
-               goto error;
+               return -1;
        }
        printk("OK.\n");
 
@@ -130,10 +129,6 @@ static int __init check_nmi_watchdog(void)
 
        kfree(prev_nmi_count);
        return 0;
-error:
-       timer_ack = !cpu_has_tsc;
-
-       return -1;
 }
 /* This needs to happen later in boot so counters are working */
 late_initcall(check_nmi_watchdog);