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

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Message-Id: <20180601083120.40352-1-andriy.shevchenko@linux.intel.com>
Date:   Fri,  1 Jun 2018 11:31:18 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/3] bitmap: Add bitmap_alloc(), bitmap_zalloc() and bitmap_free()

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@...ux.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