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lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap_zalloc()

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[ Upstream commit e829c2e4744850bab4d8f8ffebd00df10b4c6c2b ]

Provide managed variants of bitmap_alloc() and bitmap_zalloc().

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2021-03-15 10:13:56 +01:00 committed by Greg Kroah-Hartman
parent 1238da5f32
commit 26a10aef28
2 changed files with 41 additions and 0 deletions
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8
include/linux/bitmap.h
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@ -9,6 +9,8 @@
#include <linux/string.h>
#include <linux/types.h>
struct device;
/*
* bitmaps provide bit arrays that consume one or more unsigned
* longs. The bitmap interface and available operations are listed
@ -122,6 +124,12 @@ extern unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags);
extern unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags);
extern void bitmap_free(const unsigned long *bitmap);
/* Managed variants of the above. */
unsigned long *devm_bitmap_alloc(struct device *dev,
unsigned int nbits, gfp_t flags);
unsigned long *devm_bitmap_zalloc(struct device *dev,
unsigned int nbits, gfp_t flags);
/*
* lib/bitmap.c provides these functions:
*/

33
lib/bitmap.c
View File

@ -8,6 +8,7 @@
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/kernel.h>
@ -1263,6 +1264,38 @@ void bitmap_free(const unsigned long *bitmap)
}
EXPORT_SYMBOL(bitmap_free);
static void devm_bitmap_free(void *data)
{
unsigned long *bitmap = data;
bitmap_free(bitmap);
}
unsigned long *devm_bitmap_alloc(struct device *dev,
unsigned int nbits, gfp_t flags)
{
unsigned long *bitmap;
int ret;
bitmap = bitmap_alloc(nbits, flags);
if (!bitmap)
return NULL;
ret = devm_add_action_or_reset(dev, devm_bitmap_free, bitmap);
if (ret)
return NULL;
return bitmap;
}
EXPORT_SYMBOL_GPL(devm_bitmap_alloc);
unsigned long *devm_bitmap_zalloc(struct device *dev,
unsigned int nbits, gfp_t flags)
{
return devm_bitmap_alloc(dev, nbits, flags | __GFP_ZERO);
}
EXPORT_SYMBOL_GPL(devm_bitmap_zalloc);
#if BITS_PER_LONG == 64
/**
* bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap