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locking: Introduce __cleanup() based infrastructure

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Use __attribute__((__cleanup__(func))) to build:

 - simple auto-release pointers using __free()

 - 'classes' with constructor and destructor semantics for
   scope-based resource management.

 - lock guards based on the above classes.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230612093537.614161713%40infradead.org
This commit is contained in:
Peter Zijlstra
2023-05-26 12:23:48 +02:00
parent 9a1f37ebcf
commit 54da6a0924
16 changed files with 272 additions and 1 deletions
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2
include/linux/sched/task.h
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@@ -125,6 +125,8 @@ static inline void put_task_struct(struct task_struct *t)
__put_task_struct(t);
}
DEFINE_FREE(put_task, struct task_struct *, if (_T) put_task_struct(_T))
static inline void put_task_struct_many(struct task_struct *t, int nr)
{
if (refcount_sub_and_test(nr, &t->usage))