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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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23
include/linux/smp.h
View file

@ -12,29 +12,22 @@
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/llist.h>
#include <linux/smp_types.h>
typedef void (*smp_call_func_t)(void *info);
typedef bool (*smp_cond_func_t)(int cpu, void *info);
enum {
CSD_FLAG_LOCK = 0x01,
/* IRQ_WORK_flags */
CSD_TYPE_ASYNC = 0x00,
CSD_TYPE_SYNC = 0x10,
CSD_TYPE_IRQ_WORK = 0x20,
CSD_TYPE_TTWU = 0x30,
CSD_FLAG_TYPE_MASK = 0xF0,
};
/*
* structure shares (partial) layout with struct irq_work
*/
struct __call_single_data {
struct llist_node llist;
unsigned int flags;
union {
struct __call_single_node node;
struct {
struct llist_node llist;
unsigned int flags;
};
};
smp_call_func_t func;
void *info;
};