[PATCH] bitmap: Add bitmap_valloc(), bitmap_vzalloc() and bitmap_vfree()

[Peng Wang]

Introduce bitmap alloc/free helpers when contiguous
memory is not necessary.

Signed-off-by: Peng Wang <rock...@whu.edu.cn>
---
 include/linux/bitmap.h |  3 +++
 lib/bitmap.c           | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index f58e97446abc..aaad1b33dfd5 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -111,6 +111,9 @@
 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);
+extern unsigned long *bitmap_valloc(unsigned int nbits, gfp_t flags);
+extern unsigned long *bitmap_vzalloc(unsigned int nbits, gfp_t flags);
+extern void bitmap_vfree(const unsigned long *bitmap);
 
 /*
  * lib/bitmap.c provides these functions:
diff --git a/lib/bitmap.c b/lib/bitmap.c
index eead55aa7170..739597e436ad 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1139,6 +1139,25 @@ void bitmap_free(const unsigned long *bitmap)
 }
 EXPORT_SYMBOL(bitmap_free);
 
+unsigned long *bitmap_valloc(unsigned int nbits, gfp_t flags)
+{
+       return kvmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long),
+                            flags);
+}
+EXPORT_SYMBOL(bitmap_valloc);
+
+unsigned long *bitmap_vzalloc(unsigned int nbits, gfp_t flags)
+{
+       return bitmap_valloc(nbits, flags | __GFP_ZERO);
+}
+EXPORT_SYMBOL(bitmap_vzalloc);
+
+void bitmap_vfree(const unsigned long *bitmap)
+{
+       kvfree(bitmap);
+}
+EXPORT_SYMBOL(bitmap_vfree);
+
 #if BITS_PER_LONG == 64
 /**
  * bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap
-- 
2.19.1