From 6c8557bdb28df3ae97476c5e2aed6373cd235aab Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 19 May 2017 12:58:25 +0200
Subject: [PATCH] smp, cpumask: Use non-atomic cpumask_{set,clear}_cpu()
Git-commit: 6c8557bdb28df3ae97476c5e2aed6373cd235aab
Patch-mainline: v4.13-rc1
References: bsc#1050549
The cpumasks in smp_call_function_many() are private and not subject
to concurrency, atomic bitops are pointless and expensive.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
include/linux/cpumask.h | 11 +++++++++++
kernel/smp.c | 4 ++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index a21b1fb9a968..4bf4479a3a80 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -293,6 +293,12 @@ static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
set_bit(cpumask_check(cpu), cpumask_bits(dstp));
}
+static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
+{
+ __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
+}
+
+
/**
* cpumask_clear_cpu - clear a cpu in a cpumask
* @cpu: cpu number (< nr_cpu_ids)
@@ -303,6 +309,11 @@ static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
}
+static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
+{
+ __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
+}
+
/**
* cpumask_test_cpu - test for a cpu in a cpumask
* @cpu: cpu number (< nr_cpu_ids)
diff --git a/kernel/smp.c b/kernel/smp.c
index 76d16fe3c427..3061483cb3ad 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -436,7 +436,7 @@ void smp_call_function_many(const struct cpumask *mask,
cfd = this_cpu_ptr(&cfd_data);
cpumask_and(cfd->cpumask, mask, cpu_online_mask);
- cpumask_clear_cpu(this_cpu, cfd->cpumask);
+ __cpumask_clear_cpu(this_cpu, cfd->cpumask);
/* Some callers race with other cpus changing the passed mask */
if (unlikely(!cpumask_weight(cfd->cpumask)))
@@ -452,7 +452,7 @@ void smp_call_function_many(const struct cpumask *mask,
csd->func = func;
csd->info = info;
if (llist_add(&csd->llist, &per_cpu(call_single_queue, cpu)))
- cpumask_set_cpu(cpu, cfd->cpumask_ipi);
+ __cpumask_set_cpu(cpu, cfd->cpumask_ipi);
}
/* Send a message to all CPUs in the map */
--
2.12.0