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| author | Nicolai Stange <nstange@suse.de> | 2018-07-27 12:46:29 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-08-05 09:53:12 +0200 |
| commit | 9aee5f8a7e30330d0a8f4c626dc924ca5590aba5 (patch) | |
| tree | 58c5f4b8719e230b83f9fd5c860e4c8b820c52c7 /arch/x86/include/asm/hardirq.h | |
| parent | 5b6ccc6c3b1a477fbac9ec97a0b4c1c48e765209 (diff) | |
| download | lwn-9aee5f8a7e30330d0a8f4c626dc924ca5590aba5.tar.gz lwn-9aee5f8a7e30330d0a8f4c626dc924ca5590aba5.zip | |
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: 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>
Diffstat (limited to 'arch/x86/include/asm/hardirq.h')
| -rw-r--r-- | arch/x86/include/asm/hardirq.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h index 740a428acf1e..e39c606de6f6 100644 --- a/arch/x86/include/asm/hardirq.h +++ b/arch/x86/include/asm/hardirq.h @@ -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 */ |