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assign_vector_locked() calls allocate_vector() to get a real vector for an IRQ. If the current target CPU is online and in the new requested affinity mask, allocate_vector() will return 0 and nothing should be done. But, assign_vector_locked() calls apic_update_irq_cfg() even in that case which is pointless. allocate_vector() is not called from anything else, so the functions can be merged and in case of no change the apic_update_irq_cfg() can be avoided. [ tglx: Massaged changelog ] Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180511080956.6316-1-douly.fnst@cn.fujitsu.com |
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| .. | ||
| apic.c | ||
| apic_common.c | ||
| apic_flat_64.c | ||
| apic_noop.c | ||
| apic_numachip.c | ||
| bigsmp_32.c | ||
| hw_nmi.c | ||
| io_apic.c | ||
| ipi.c | ||
| Makefile | ||
| msi.c | ||
| probe_32.c | ||
| probe_64.c | ||
| vector.c | ||
| x2apic.h | ||
| x2apic_cluster.c | ||
| x2apic_phys.c | ||
| x2apic_uv_x.c | ||