You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
1.2 KiB
37 lines
1.2 KiB
From: James Hogan <james.hogan@imgtec.com>
|
|
Date: Thu, 3 Mar 2016 21:30:42 +0000
|
|
Subject: [PATCH] MIPS: c-r4k: Exclude sibling CPUs in SMP calls
|
|
|
|
When performing SMP calls to foreign cores, exclude sibling CPUs from
|
|
the provided map, as we already handle the local core on the current
|
|
CPU. This prevents an IPI call from for example core 0, VPE 1 to VPE 0
|
|
on the same core.
|
|
|
|
Signed-off-by: James Hogan <james.hogan@imgtec.com>
|
|
Cc: Ralf Baechle <ralf@linux-mips.org>
|
|
Cc: Paul Burton <paul.burton@imgtec.com>
|
|
Cc: linux-mips@linux-mips.org
|
|
---
|
|
|
|
--- a/arch/mips/mm/c-r4k.c
|
|
+++ b/arch/mips/mm/c-r4k.c
|
|
@@ -96,8 +96,17 @@ static inline void r4k_on_each_cpu(unsig
|
|
void (*func) (void *info), void *info)
|
|
{
|
|
preempt_disable();
|
|
- if (r4k_op_needs_ipi(type))
|
|
- smp_call_function_many(&cpu_foreign_map, func, info, 1);
|
|
+ /* cpu_foreign_map and cpu_sibling_map[] undeclared when !CONFIG_SMP */
|
|
+#ifdef CONFIG_SMP
|
|
+ if (r4k_op_needs_ipi(type)) {
|
|
+ struct cpumask mask;
|
|
+
|
|
+ /* exclude sibling CPUs */
|
|
+ cpumask_andnot(&mask, &cpu_foreign_map,
|
|
+ &cpu_sibling_map[smp_processor_id()]);
|
|
+ smp_call_function_many(&mask, func, info, 1);
|
|
+ }
|
|
+#endif
|
|
func(info);
|
|
preempt_enable();
|
|
}
|
|
|