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[PATCH] x86_64: Reduce NMI watchdog stack usage

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NR_CPUs can be quite big these days.  kmalloc the per CPU array instead of
putting it onto the stack

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-16 21:53:19 -07:00 committed by Linus Torvalds
parent 7179906293
commit ac6b931c44
1 changed files with 9 additions and 1 deletions
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10
arch/x86_64/kernel/nmi.c
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@ -114,7 +114,7 @@ static __init int cpu_has_lapic(void)
static int __init check_nmi_watchdog (void) static int __init check_nmi_watchdog (void)
{ {
int counts[NR_CPUS]; int *counts;
int cpu; int cpu;
if (nmi_watchdog == NMI_NONE) if (nmi_watchdog == NMI_NONE)
@ -125,6 +125,12 @@ static int __init check_nmi_watchdog (void)
return -1; return -1;
} }
counts = kmalloc(NR_CPUS * sizeof(int),GFP_KERNEL);
if (!counts) {
nmi_watchdog = NMI_NONE;
return 0;
}
printk(KERN_INFO "Testing NMI watchdog ... "); printk(KERN_INFO "Testing NMI watchdog ... ");
for (cpu = 0; cpu < NR_CPUS; cpu++) for (cpu = 0; cpu < NR_CPUS; cpu++)
@ -139,6 +145,7 @@ static int __init check_nmi_watchdog (void)
cpu_pda[cpu].__nmi_count); cpu_pda[cpu].__nmi_count);
nmi_active = 0; nmi_active = 0;
lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG; lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;
kfree(counts);
return -1; return -1;
} }
} }
@ -149,6 +156,7 @@ static int __init check_nmi_watchdog (void)
if (nmi_watchdog == NMI_LOCAL_APIC) if (nmi_watchdog == NMI_LOCAL_APIC)
nmi_hz = 1; nmi_hz = 1;
kfree(counts);
return 0; return 0;
} }
/* Have this called later during boot so counters are updating */ /* Have this called later during boot so counters are updating */