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    Subject[PATCH 4.18 64/79] x86/irq: Demote irq_cpustat_t::__softirq_pending to u16
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Nicolai Stange <nstange@suse.de>

    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>
    ---
    arch/x86/include/asm/hardirq.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- 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 */

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