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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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7
include/linux/irqflags.h
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@@ -13,6 +13,7 @@
#define _LINUX_TRACE_IRQFLAGS_H
#include <linux/typecheck.h>
#include <linux/cleanup.h>
#include <asm/irqflags.h>
#include <asm/percpu.h>
@@ -267,4 +268,10 @@ extern void warn_bogus_irq_restore(void);
#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable())
DEFINE_LOCK_GUARD_0(irqsave,
local_irq_save(_T->flags),
local_irq_restore(_T->flags),
unsigned long flags)
#endif