softints and interlocking, sorry.
> On 23 Jan 2015, at 10:52 pm, David Gwynne <da...@gwynne.id.au> wrote:
>
> when a softint gets scheduled, we set a bit in the current cpus
> cpu_info structure. that doesnt have to be an interlocked operation
> to be locally atomic.
>
> ok?
>
> Index: arch/amd64/amd64/intr.c
> ===================================================================
> RCS file: /cvs/src/sys/arch/amd64/amd64/intr.c,v
> retrieving revision 1.40
> diff -u -p -r1.40 intr.c
> --- arch/amd64/amd64/intr.c 6 Jan 2015 12:50:47 -0000 1.40
> +++ arch/amd64/amd64/intr.c 23 Jan 2015 12:50:20 -0000
> @@ -721,6 +721,6 @@ softintr(int sir)
> {
> struct cpu_info *ci = curcpu();
>
> - __asm volatile("lock; orq %1, %0" :
> + __asm volatile("orq %1, %0" :
> "=m"(ci->ci_ipending) : "ir" (1UL << sir));
> }
