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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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3
include/linux/rcupdate.h
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@@ -27,6 +27,7 @@
#include <linux/preempt.h>
#include <linux/bottom_half.h>
#include <linux/lockdep.h>
#include <linux/cleanup.h>
#include <asm/processor.h>
#include <linux/cpumask.h>
#include <linux/context_tracking_irq.h>
@@ -1095,4 +1096,6 @@ rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
extern int rcu_expedited;
extern int rcu_normal;
DEFINE_LOCK_GUARD_0(rcu, rcu_read_lock(), rcu_read_unlock())
#endif /* __LINUX_RCUPDATE_H */