On Fri, Mar 20, 2015 at 12:28:25PM +0100, Alexander Graf wrote:
>
>
> On 20.03.15 10:39, Paul Mackerras wrote:
> > + /* On POWER8 for IPIs to threads in the same core, use msgsnd */
> > + if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
> > + (cpu & ~7) == (raw_smp_processor_id() & ~7)) {
>
> Can we somehow encapsulate the secret knowledge that 8 threads mean one
> core?
Looks like I want:
if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
cpu_first_thread_sibling(cpu) ==
cpu_first_thread_sibling(raw_smp_processor_id())) {
Paul.
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