linux-kernel - [PATCH] bitmap: Add bitmap_valloc(), bitmap_vzalloc() and bitmap

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Date:   Fri, 28 Dec 2018 00:18:29 +0800
From:   Peng Wang <rocking@....edu.cn>
To:     andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
        ynorov@...iumnetworks.com, arnd@...db.de, rocking@....edu.cn,
        courbet@...gle.com, osandov@...com, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] bitmap: Add bitmap_valloc(), bitmap_vzalloc() and bitmap_vfree()

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

Signed-off-by: Peng Wang <rocking@....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