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| author | Nicolai Stange <nstange@suse.de> | 2018-07-27 12:46:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-15 17:37:32 +0200 |
| commit | 6120bb28672d72e6df1459bd4aeaf1520ca5bc30 (patch) | |
| tree | 4e0662e31265a932e15ff3d894b6e95430e2c918 | |
| parent | 2754f7c6ec884c9fec1d9e100a78c88512fa6b4e (diff) | |
| download | linux-stable-6120bb28672d72e6df1459bd4aeaf1520ca5bc30.tar.gz linux-stable-6120bb28672d72e6df1459bd4aeaf1520ca5bc30.tar.bz2 linux-stable-6120bb28672d72e6df1459bd4aeaf1520ca5bc30.zip | |
x86/irq: Demote irq_cpustat_t::__softirq_pending to u16
commit 9aee5f8a7e30330d0a8f4c626dc924ca5590aba5 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 */ |