linux-kernel - [patch RFC] mm/slab: introduce KZALLOC

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Date: Fri, 15 Mar 2024 14:22:49 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	cl@...ux.com,
	penberg@...nel.org,
	rientjes@...gle.com,
	iamjoonsoo.kim@....com,
	akpm@...ux-foundation.org,
	vbabka@...e.cz,
	roman.gushchin@...ux.dev,
	42.hyeyoo@...il.com,
	peterz@...radead.org,
	mingo@...nel.org,
	danielj@...dia.com
Subject: [patch RFC] mm/slab: introduce KZALLOC_FREE() cleanup-ed allocation macro

From: Jiri Pirko <jiri@...dia.com>

With introduction of __free() macro using cleanup infrastructure, it
will very likely become quite common to see following pattern:
	type *var __free(kfree) = kzalloc(sizeof(*var), GFP_KERNEL);

To follow the CLASS() flow from cleanup.h, introduce a simple macro
KZALLOC_FREE() to wrap this over and allow the same flow.

Show an example usage in gpio-sim driver.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/gpio/gpio-sim.c | 3 +--
 include/linux/slab.h    | 3 +++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
index c4106e37e6db..997237b3d80c 100644
--- a/drivers/gpio/gpio-sim.c
+++ b/drivers/gpio/gpio-sim.c
@@ -1496,8 +1496,7 @@ gpio_sim_config_make_device_group(struct config_group *group, const char *name)
 {
 	int id;
 
-	struct gpio_sim_device *dev __free(kfree) = kzalloc(sizeof(*dev),
-							    GFP_KERNEL);
+	KZALLOC_FREE(struct gpio_sim_device *, dev, GFP_KERNEL);
 	if (!dev)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/include/linux/slab.h b/include/linux/slab.h
index b5f5ee8308d0..baee6acd58d3 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -711,6 +711,9 @@ static inline __alloc_size(1) void *kzalloc(size_t size, gfp_t flags)
 	return kmalloc(size, flags | __GFP_ZERO);
 }
 
+#define KZALLOC_FREE(_type, var, _gfp_t)				\
+	_type var __free(kfree) = kzalloc(sizeof(*var), _gfp_t)
+
 /**
  * kzalloc_node - allocate zeroed memory from a particular memory node.
  * @size: how many bytes of memory are required.
-- 
2.44.0