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Commit 9aee5f8a authored by Nicolai Stange's avatar Nicolai Stange Committed by Thomas Gleixner
Browse files

x86/irq: Demote irq_cpustat_t::__softirq_pending to u16 



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: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarNicolai Stange <nstange@suse.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 5b6ccc6c

arch/x86/include/asm/hardirq.h

+1 −1
Original line number Diff line number Diff line
@@ -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 */