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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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4
include/linux/mutex.h
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@@ -19,6 +19,7 @@
#include <asm/processor.h>
#include <linux/osq_lock.h>
#include <linux/debug_locks.h>
#include <linux/cleanup.h>
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
@@ -219,4 +220,7 @@ extern void mutex_unlock(struct mutex *lock);
extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
DEFINE_GUARD(mutex, struct mutex *, mutex_lock(_T), mutex_unlock(_T))
DEFINE_FREE(mutex, struct mutex *, if (_T) mutex_unlock(_T))
#endif /* __LINUX_MUTEX_H */