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authorPaul E. McKenney <paulmck@kernel.org>2020-06-29 17:21:32 -0700
committerPaul E. McKenney <paulmck@kernel.org>2020-09-04 11:50:50 -0700
commite48c15b796d412ede883bb2ef7779b2a142f7962 (patch)
treef59df2675d2b3326e583e8dfeb661394f0054702 /kernel
parent160c7ba34605d9b59ee406a1b4a61b0f942b1ae9 (diff)
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smp: Add source and destination CPUs to __call_single_data
This commit adds a destination CPU to __call_single_data, and is inspired by an earlier commit by Peter Zijlstra. This version adds #ifdef to permit use by 32-bit systems and supplying the destination CPU for all smp_call_function*() requests, not just smp_call_function_single(). If need be, 32-bit systems could be accommodated by shrinking the flags field to 16 bits (the atomic_t variant is currently unused) and by providing only eight bits for CPU on such systems. It is not clear that the addition of the fields to __call_single_node are really needed. [ paulmck: Apply Boqun Feng feedback on 32-bit builds. ] Link: https://lore.kernel.org/lkml/20200615164048.GC2531@hirez.programming.kicks-ass.net/ Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/smp.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index d0ae8eb6bf8b..865a876f83ce 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -375,6 +375,9 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info,
csd->func = func;
csd->info = info;
+#ifdef CONFIG_64BIT
+ csd->dst = cpu;
+#endif
err = generic_exec_single(cpu, csd);
@@ -540,6 +543,9 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
csd->flags |= CSD_TYPE_SYNC;
csd->func = func;
csd->info = info;
+#ifdef CONFIG_64BIT
+ csd->dst = cpu;
+#endif
if (llist_add(&csd->llist, &per_cpu(call_single_queue, cpu)))
__cpumask_set_cpu(cpu, cfd->cpumask_ipi);
}