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    Subject[PATCH 18/26] x86 - nmi: Convert nmi_lock to raw_spinlock
    Date
    Convert locks that cannot sleep in preempt-rt to raw_spinlocks

    See also: a76dd8f3ffcbb1bb446a9ca059b77f40fe100bf1

    Signed-off-by: John Kacur <jkacur@redhat.com>
    ---
    arch/x86/kernel/apic/nmi.c | 6 +++---
    1 files changed, 3 insertions(+), 3 deletions(-)

    diff --git a/arch/x86/kernel/apic/nmi.c b/arch/x86/kernel/apic/nmi.c
    index 0159a69..51bc6a6 100644
    --- a/arch/x86/kernel/apic/nmi.c
    +++ b/arch/x86/kernel/apic/nmi.c
    @@ -416,13 +416,13 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)

    /* We can be called before check_nmi_watchdog, hence NULL check. */
    if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
    - static DEFINE_SPINLOCK(lock); /* Serialise the printks */
    + static DEFINE_RAW_SPINLOCK(lock); /* Serialise the printks */

    - spin_lock(&lock);
    + raw_spin_lock(&lock);
    printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
    show_regs(regs);
    dump_stack();
    - spin_unlock(&lock);
    + raw_spin_unlock(&lock);
    cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));

    rc = 1;
    --
    1.6.5.2


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