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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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5
include/linux/srcu.h
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@@ -343,4 +343,9 @@ static inline void smp_mb__after_srcu_read_unlock(void)
/* __srcu_read_unlock has smp_mb() internally so nothing to do here. */
}
DEFINE_LOCK_GUARD_1(srcu, struct srcu_struct,
_T->idx = srcu_read_lock(_T->lock),
srcu_read_unlock(_T->lock, _T->idx),
int idx)
#endif