diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/091-MIPS-c-r4k-Exclude-sibling-CPUs-in-SMP-calls.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/091-MIPS-c-r4k-Exclude-sibling-CPUs-in-SMP-calls.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/091-MIPS-c-r4k-Exclude-sibling-CPUs-in-SMP-calls.patch b/target/linux/generic/patches-4.4/091-MIPS-c-r4k-Exclude-sibling-CPUs-in-SMP-calls.patch new file mode 100644 index 0000000000..8d5030c84b --- /dev/null +++ b/target/linux/generic/patches-4.4/091-MIPS-c-r4k-Exclude-sibling-CPUs-in-SMP-calls.patch @@ -0,0 +1,37 @@ +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(); + } |