locking: Introduce __cleanup() based infrastructure
commit 54da6a0924311c7cf5015533991e44fb8eb12773 upstream.
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) <[email protected]>
Link: https://lkml.kernel.org/r/20230612093537.614161713%40infradead.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 8cfcc5d..9aa6358a 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -8,6 +8,7 @@
*/
#include <linux/linkage.h>
+#include <linux/cleanup.h>
#include <linux/list.h>
/*
@@ -474,4 +475,8 @@ static __always_inline void preempt_enable_nested(void)
preempt_enable();
}
+DEFINE_LOCK_GUARD_0(preempt, preempt_disable(), preempt_enable())
+DEFINE_LOCK_GUARD_0(preempt_notrace, preempt_disable_notrace(), preempt_enable_notrace())
+DEFINE_LOCK_GUARD_0(migrate, migrate_disable(), migrate_enable())
+
#endif /* __LINUX_PREEMPT_H */
