MIPS: introduce cpu_coherent_mask
Add a mask of CPUs which are currently known to be operating coherently.
This is setup initially to be all present CPUs, but in a subsequent
patch CPUs in a MIPS Coherent Processing System will be cleared in this
mask as they enter non-coherent idle states. This will be used in order
to determine when a CPU within a CPS system may need to be powered back
up, but may also be used in future to optimise away wakeups for cache
operations or TLB invalidations.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index efa02ac..b037334 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -46,6 +46,9 @@
extern volatile cpumask_t cpu_callin_map;
+/* Mask of CPUs which are currently definitely operating coherently */
+extern cpumask_t cpu_coherent_mask;
+
extern void asmlinkage smp_bootstrap(void);
/*