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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-08-01 15:42:56 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-08-01 15:49:40 -0700
commitc42b65e363ce97a828f81b59033c3558f8fa7f70 (patch)
treed664c268ae9a49f22b22a2de4d0a56d7925a1bd5
parente64e4018d572710c44f42c923d4ac059f0a23320 (diff)
downloadlinux-c42b65e363ce97a828f81b59033c3558f8fa7f70.tar.bz2
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>
-rw-r--r--include/linux/bitmap.h8
-rw-r--r--lib/bitmap.c20
2 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 1ee46f492267..acf5e8df3504 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -105,6 +105,14 @@
*/
/*
+ * Allocation and deallocation of bitmap.
+ * Provided in lib/bitmap.c to avoid circular dependency.
+ */
+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);
+
+/*
* lib/bitmap.c provides these functions:
*/
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