path: root/arch/x86/kernel/vmiclock_32.c
diff options
authorSuresh Siddha <suresh.b.siddha@intel.com>2010-01-19 12:20:54 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-01-19 13:40:29 -0800
commit97943390b043bcafca69f9163b86bbf627b75589 (patch)
treea8c7d56179fee618720db9edc042f7bf3d68db51 /arch/x86/kernel/vmiclock_32.c
parent6579b474572fd54c583ac074e8e7aaae926c62ef (diff)
x86, irq: Don't block IRQ0_VECTOR..IRQ15_VECTOR's on all cpu's
Currently IRQ0..IRQ15 are assigned to IRQ0_VECTOR..IRQ15_VECTOR's on all the cpu's. If these IRQ's are handled by legacy pic controller, then the kernel handles them only on cpu 0. So there is no need to block this vector space on all cpu's. Similarly if these IRQ's are handled by IO-APIC, then the IRQ affinity will determine on which cpu's we need allocate the vector resource for that particular IRQ. This can be done dynamically and here also there is no need to block 16 vectors for IRQ0..IRQ15 on all cpu's. Fix this by initially assigning IRQ0..IRQ15 to IRQ0_VECTOR..IRQ15_VECTOR's only on cpu 0. If the legacy controllers like pic handles these irq's, then this configuration will be fixed. If more modern controllers like IO-APIC handle these IRQ's, then we start with this configuration and as IRQ's migrate, vectors (/and cpu's) associated with these IRQ's change dynamically. This will freeup the block of 16 vectors on other cpu's which don't handle IRQ0..IRQ15, which can now be used for other IRQ's that the particular cpu handle. [ hpa: this also an architectural cleanup for future legacy-PIC-free configurations. ] [ hpa: fixed typo NR_LEGACY_IRQS -> NR_IRQS_LEGACY ] Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <1263932453.2814.52.camel@sbs-t61.sc.intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/vmiclock_32.c')
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/vmiclock_32.c b/arch/x86/kernel/vmiclock_32.c
index 1268d993e9c..2f1ca561429 100644
--- a/arch/x86/kernel/vmiclock_32.c
+++ b/arch/x86/kernel/vmiclock_32.c
@@ -235,6 +235,8 @@ void __init vmi_time_init(void)
setup_irq(0, &vmi_clock_action);
+ for_each_possible_cpu(cpu)
+ per_cpu(vector_irq, cpu)[vmi_get_timer_vector()] = 0;