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x86/irq: Demote irq_cpustat_t::__softirq_pending to u16

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An upcoming patch will extend KVM's L1TF mitigation in conditional mode
to also cover interrupts after VMEXITs. For tracking those, stores to a
new per-cpu flag from interrupt handlers will become necessary.

In order to improve cache locality, this new flag will be added to x86's
irq_cpustat_t.

Make some space available there by shrinking the ->softirq_pending bitfield
from 32 to 16 bits: the number of bits actually used is only NR_SOFTIRQS,
i.e. 10.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nicolai Stange 2018-07-27 12:46:29 +02:00 committed by Thomas Gleixner
parent 5b6ccc6c3b
commit 9aee5f8a7e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/hardirq.h
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@ -6,7 +6,7 @@
#include <linux/irq.h>
typedef struct {
unsigned int __softirq_pending;
u16 __softirq_pending;
unsigned int __nmi_count; /* arch dependent */
#ifdef CONFIG_X86_LOCAL_APIC
unsigned int apic_timer_irqs; /* arch dependent */