[PATCH v1 1/3] bitmap: Add bitmap_alloc(), bitmap_zalloc() and bitmap_free()

Andy Shevchenko
2018-06-01T08:31:29Z

A lot of code become ugly because of open coding allocations for bitmaps.

Introduce three helpers to allow users be more clear of intention
and keep their code neat.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/bitmap.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 1ee46f492267..845822425393 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -6,6 +6,7 @@

#include <linux/types.h>
#include <linux/bitops.h>
+#include <linux/slab.h>
#include <linux/string.h>
#include <linux/kernel.h>

@@ -104,6 +105,21 @@
* contain all bit positions from 0 to 'bits' - 1.
*/

+static inline unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
+{
+ return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long), flags);
+}
+
+static inline unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags)
+{
+ return kcalloc(BITS_TO_LONGS(nbits), sizeof(unsigned long), flags);
+}
+
+static inline void bitmap_free(const unsigned long *bitmap)
+{
+ kfree(bitmap);
+}
+
/*
* lib/bitmap.c provides these functions:
*/
--
2.17.0