diff options
| author | Paul E. McKenney <[email protected]> | 2020-06-29 17:21:32 -0700 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2020-09-04 11:50:50 -0700 |
| commit | e48c15b796d412ede883bb2ef7779b2a142f7962 (patch) | |
| tree | f59df2675d2b3326e583e8dfeb661394f0054702 /include/linux | |
| parent | 160c7ba34605d9b59ee406a1b4a61b0f942b1ae9 (diff) | |
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/[email protected]/
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/smp.h | 3 | ||||
| -rw-r--r-- | include/linux/smp_types.h | 3 |
2 files changed, 6 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; diff --git a/include/linux/smp_types.h b/include/linux/smp_types.h index 364b3ae3e41d..2e8461af8df6 100644 --- a/include/linux/smp_types.h +++ b/include/linux/smp_types.h @@ -61,6 +61,9 @@ struct __call_single_node { unsigned int u_flags; atomic_t a_flags; }; +#ifdef CONFIG_64BIT + u16 src, dst; +#endif }; #endif /* __LINUX_SMP_TYPES_H */ |