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SubjectRe: [PATCH] [3/11] x86: Stop MCEs and NMIs during code patching
Andi Kleen wrote:
> +void stop_nmi(void)
> +{
> + ignore_nmis++;
> + acpi_nmi_disable();
> +}
> +
> +void restart_nmi(void)
> +{
> + ignore_nmis--;
> + acpi_nmi_enable();
> +}
>

Wouldn't it be better to just assign ignore_nmis rather than inc/dec it
(and perhaps BUG on a double stop or restart)? Also, is
acpi_nmi_disable/enable's use of on_each_cpu safe with interrupts
disabled if we know there's only one CPU alive at this point?

J
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