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

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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 <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20200622100825.844455025@infradead.org
This commit is contained in:
Peter Zijlstra
2020-06-22 12:01:25 +02:00
committed by Borislav Petkov
parent 739f70b476
commit 8c4890d1c3
6 changed files with 86 additions and 58 deletions
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26
include/linux/irq_work.h
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@@ -2,7 +2,7 @@
#ifndef _LINUX_IRQ_WORK_H
#define _LINUX_IRQ_WORK_H
#include <linux/llist.h>
#include <linux/smp_types.h>
/*
* An entry can be in one of four states:
@@ -13,24 +13,14 @@
* busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
*/
/* flags share CSD_FLAG_ space */
#define IRQ_WORK_PENDING BIT(0)
#define IRQ_WORK_BUSY BIT(1)
/* Doesn't want IPI, wait for tick: */
#define IRQ_WORK_LAZY BIT(2)
/* Run hard IRQ context, even on RT */
#define IRQ_WORK_HARD_IRQ BIT(3)
#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
/*
* structure shares layout with single_call_data_t.
*/
struct irq_work {
struct llist_node llnode;
atomic_t flags;
union {
struct __call_single_node node;
struct {
struct llist_node llnode;
atomic_t flags;
};
};
void (*func)(struct irq_work *);
};