[PATCH v3 07/11] lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap_zalloc()

Bartosz Golaszewski
2021-03-09T21:00:46Z

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>
---
include/linux/bitmap.h | 8 ++++++++
lib/bitmap.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 3282db97e06c..73d039476fa4 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -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 @@ unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags);
unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags);
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:
*/
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 78f70d9007ad..b4fd7fd084c6 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -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(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(devm_bitmap_zalloc);
+
#if BITS_PER_LONG == 64
/**
* bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap
--
2.30.1