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| author |   Paul E. McKenney <paulmck@kernel.org> | 2020-06-29 17:21:32 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-09-04 11:50:50 -0700 |
| commit | e48c15b796d412ede883bb2ef7779b2a142f7962 (patch) | |
| tree | f59df2675d2b3326e583e8dfeb661394f0054702 /kernel/smp.c | |
| parent | lib: Add backtrace_idle parameter to force backtrace of idle CPUs (diff) | |
| download | linux-dev-e48c15b796d412ede883bb2ef7779b2a142f7962.tar.xz linux-dev-e48c15b796d412ede883bb2ef7779b2a142f7962.zip | |
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/smp.c')
| -rw-r--r-- | kernel/smp.c | 6 |
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); } |