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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/percpu.h
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@@ -8,6 +8,7 @@
#include <linux/cpumask.h>
#include <linux/pfn.h>
#include <linux/init.h>
#include <linux/cleanup.h>
#include <asm/percpu.h>
@@ -127,6 +128,9 @@ extern void __init setup_per_cpu_areas(void);
extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp) __alloc_size(1);
extern void __percpu *__alloc_percpu(size_t size, size_t align) __alloc_size(1);
extern void free_percpu(void __percpu *__pdata);
DEFINE_FREE(free_percpu, void __percpu *, free_percpu(_T))
extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
#define alloc_percpu_gfp(type, gfp) \