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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-08-02 01:42:56 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-08-02 01:49:40 +0300
commitc42b65e363ce97a828f81b59033c3558f8fa7f70 (patch)
treed664c268ae9a49f22b22a2de4d0a56d7925a1bd5 /lib
parente64e4018d572710c44f42c923d4ac059f0a23320 (diff)
downloadlinux-c42b65e363ce97a828f81b59033c3558f8fa7f70.tar.xz
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. Note, due to multiple circular dependencies we may not provide the helpers as inliners. For now we keep them exported and, perhaps, at some point in the future we will sort out header inclusion and inheritance. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/bitmap.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index a42eff7e8c48..5b476d8414be 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -13,6 +13,7 @@
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/kernel.h>
+#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
@@ -1128,6 +1129,25 @@ void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int n
EXPORT_SYMBOL(bitmap_copy_le);
#endif
+unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
+{
+ return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long),
+ flags);
+}
+EXPORT_SYMBOL(bitmap_alloc);
+
+unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags)
+{
+ return bitmap_alloc(nbits, flags | __GFP_ZERO);
+}
+EXPORT_SYMBOL(bitmap_zalloc);
+
+void bitmap_free(const unsigned long *bitmap)
+{
+ kfree(bitmap);
+}
+EXPORT_SYMBOL(bitmap_free);
+
#if BITS_PER_LONG == 64
/**
* bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap