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38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From: James Hogan <james.hogan@imgtec.com>
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Date: Thu, 3 Mar 2016 21:30:42 +0000
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Subject: [PATCH] MIPS: c-r4k: Exclude sibling CPUs in SMP calls
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When performing SMP calls to foreign cores, exclude sibling CPUs from
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the provided map, as we already handle the local core on the current
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CPU. This prevents an IPI call from for example core 0, VPE 1 to VPE 0
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on the same core.
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Signed-off-by: James Hogan <james.hogan@imgtec.com>
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Cc: Ralf Baechle <ralf@linux-mips.org>
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Cc: Paul Burton <paul.burton@imgtec.com>
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Cc: linux-mips@linux-mips.org
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---
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--- a/arch/mips/mm/c-r4k.c
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+++ b/arch/mips/mm/c-r4k.c
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@@ -96,8 +96,17 @@ static inline void r4k_on_each_cpu(unsig
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void (*func) (void *info), void *info)
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{
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preempt_disable();
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- if (r4k_op_needs_ipi(type))
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- smp_call_function_many(&cpu_foreign_map, func, info, 1);
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+ /* cpu_foreign_map and cpu_sibling_map[] undeclared when !CONFIG_SMP */
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+#ifdef CONFIG_SMP
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+ if (r4k_op_needs_ipi(type)) {
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+ struct cpumask mask;
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+
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+ /* exclude sibling CPUs */
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+ cpumask_andnot(&mask, &cpu_foreign_map,
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+ &cpu_sibling_map[smp_processor_id()]);
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+ smp_call_function_many(&mask, func, info, 1);
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+ }
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+#endif
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func(info);
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preempt_enable();
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}
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