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# e48c15b7 30-Jun-2020 Paul E. McKenney <[email protected]>

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

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]>

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Revision tags: v5.8-rc3
# 8c4890d1 22-Jun-2020 Peter Zijlstra <[email protected]>

smp, irq_work: Continue smp_call_function*() and irq_work*() integration

Instead of relying on BUG_ON() to ensure the various data structures
line up, use a bunch of horrible unions to make it all a

smp, irq_work: Continue smp_call_function*() and irq_work*() integration

Instead of relying on BUG_ON() to ensure the various data structures
line up, use a bunch of horrible unions to make it all automatic.

Much of the union magic is to ensure irq_work and smp_call_function do
not (yet) see the members of their respective data structures change
name.

Suggested-by: Linus Torvalds <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Frederic Weisbecker <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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