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x86: nmi_watchdog - introduce nmi_watchdog_active() helper 

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cyrill Gorcunov 2008-06-24 22:52:06 +02:00 committed by Ingo Molnar
parent c376d45432
commit 4de0043617
2 changed files with 17 additions and 9 deletions
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13
arch/x86/kernel/nmi.c
View File

@ -119,10 +119,7 @@ int __init check_nmi_watchdog(void)
unsigned int *prev_nmi_count;
int cpu;
if (nmi_watchdog == NMI_NONE)
return 0;
if (!atomic_read(&nmi_active))
if (!nmi_watchdog_active() || !atomic_read(&nmi_active))
return 0;
prev_nmi_count = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL);
@ -317,8 +314,7 @@ void setup_apic_nmi_watchdog(void *unused)
void stop_apic_nmi_watchdog(void *unused)
{
/* only support LOCAL and IO APICs for now */
if (nmi_watchdog != NMI_LOCAL_APIC &&
nmi_watchdog != NMI_IO_APIC)
if (!nmi_watchdog_active())
return;
if (__get_cpu_var(wd_enabled) == 0)
return;
@ -348,8 +344,7 @@ static DEFINE_PER_CPU(int, nmi_touch);
void touch_nmi_watchdog(void)
{
if (nmi_watchdog == NMI_LOCAL_APIC ||
nmi_watchdog == NMI_IO_APIC) {
if (nmi_watchdog_active()) {
unsigned cpu;
/*
@ -474,7 +469,7 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
if (!!old_state == !!nmi_watchdog_enabled)
return 0;
if (atomic_read(&nmi_active) < 0 || nmi_watchdog == NMI_NONE) {
if (atomic_read(&nmi_active) < 0 || !nmi_watchdog_active()) {
printk(KERN_WARNING
"NMI watchdog is permanently disabled\n");
return -EIO;

13
include/asm-x86/nmi.h
View File

@ -56,6 +56,19 @@ static inline void localise_nmi_watchdog(void)
if (nmi_watchdog == NMI_IO_APIC)
nmi_watchdog = NMI_LOCAL_APIC;
}
/* check if nmi_watchdog is active (ie was specified at boot) */
static inline int nmi_watchdog_active(void)
{
/*
* actually it should be:
* return (nmi_watchdog == NMI_LOCAL_APIC ||
* nmi_watchdog == NMI_IO_APIC)
* but since they are power of two we could use a
* cheaper way --cvg
*/
return nmi_watchdog & 0x3;
}
#endif
void lapic_watchdog_stop(void);