powerpc/mm/nohash: Ignore NULL stale_map entries (39a421ff) · Commits · 戴 / test

This happens with threads that are offline due to CPU hotplug (including threads that were never "plugged in" to begin with because SMT is disabled). Signed-off-by:

Scott Wood <scottwood@freescale.com> Signed-off-by:

Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/mm/mmu_context_nohash.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -112,8 +112,10 @@ static unsigned int steal_context_smp(unsigned int id)
		*/
		for_each_cpu(cpu, mm_cpumask(mm)) {
		for (i = cpu_first_thread_sibling(cpu);
		i <= cpu_last_thread_sibling(cpu); i++)
		i <= cpu_last_thread_sibling(cpu); i++) {
		if (stale_map[i])
		__set_bit(id, stale_map[i]);
		}
		cpu = i - 1;
		}
		return id;
		@@ -272,6 +274,7 @@ void switch_mmu_context(struct mm_struct prev, struct mm_struct next)
		/* XXX This clear should ultimately be part of local_flush_tlb_mm */
		for (i = cpu_first_thread_sibling(cpu);
		i <= cpu_last_thread_sibling(cpu); i++) {
		if (stale_map[i])
		__clear_bit(id, stale_map[i]);
		}
		}

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