diff options
Diffstat (limited to 'arch/x86/kernel/apic/ipi.c')
| -rw-r--r-- | arch/x86/kernel/apic/ipi.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c index 7236fefde396..ca3bcdb7c4a8 100644 --- a/arch/x86/kernel/apic/ipi.c +++ b/arch/x86/kernel/apic/ipi.c @@ -5,6 +5,31 @@ #include "local.h" +#ifdef CONFIG_SMP +#ifdef CONFIG_HOTPLUG_CPU +#define DEFAULT_SEND_IPI (1) +#else +#define DEFAULT_SEND_IPI (0) +#endif + +static int apic_ipi_shorthand_off __ro_after_init = DEFAULT_SEND_IPI; + +static __init int apic_ipi_shorthand(char *str) +{ + get_option(&str, &apic_ipi_shorthand_off); + return 1; +} +__setup("no_ipi_broadcast=", apic_ipi_shorthand); + +static int __init print_ipi_mode(void) +{ + pr_info("IPI shorthand broadcast: %s\n", + apic_ipi_shorthand_off ? "disabled" : "enabled"); + return 0; +} +late_initcall(print_ipi_mode); +#endif + static inline int __prepare_ICR2(unsigned int mask) { return SET_APIC_DEST_FIELD(mask); @@ -203,7 +228,7 @@ void default_send_IPI_allbutself(int vector) if (num_online_cpus() < 2) return; - if (no_broadcast || vector == NMI_VECTOR) { + if (apic_ipi_shorthand_off || vector == NMI_VECTOR) { apic->send_IPI_mask_allbutself(cpu_online_mask, vector); } else { __default_send_IPI_shortcut(APIC_DEST_ALLBUT, vector); @@ -212,7 +237,7 @@ void default_send_IPI_allbutself(int vector) void default_send_IPI_all(int vector) { - if (no_broadcast || vector == NMI_VECTOR) { + if (apic_ipi_shorthand_off || vector == NMI_VECTOR) { apic->send_IPI_mask(cpu_online_mask, vector); } else { __default_send_IPI_shortcut(APIC_DEST_ALLINC, vector); |