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authorPaul E. McKenney <paulmck@kernel.org>2020-06-30 03:21:32 +0300
committerPaul E. McKenney <paulmck@kernel.org>2020-09-04 21:50:50 +0300
commite48c15b796d412ede883bb2ef7779b2a142f7962 (patch)
treef59df2675d2b3326e583e8dfeb661394f0054702 /include/linux/smp.h
parent160c7ba34605d9b59ee406a1b4a61b0f942b1ae9 (diff)
downloadlinux-e48c15b796d412ede883bb2ef7779b2a142f7962.tar.xz
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 'include/linux/smp.h')
-rw-r--r--include/linux/smp.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 80d557ef8a11..9f13966d3d92 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -26,6 +26,9 @@ struct __call_single_data {
struct {
struct llist_node llist;
unsigned int flags;
+#ifdef CONFIG_64BIT
+ u16 src, dst;
+#endif
};
};
smp_call_func_t func;