[PATCH] cpumask: bitmap cleanup preparation for cpumask overhaul

From: Paul Jackson <pj@sgi.com>

Document the bitmap bit model and handling of unused bits.

Tighten up bitmap so it does not generate nonzero bits in the unused tail if
it is not given any on input.

Add intersects, subset, xor and andnot operators.  Change bitmap_complement to
take two operands.

Add a couple of missing 'const' qualifiers on bitops test_bit and bitmap_equal
args.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index c301d121c8d0..bc93e0167a81 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -13,8 +13,8 @@
 int bitmap_empty(const unsigned long *bitmap, int bits);
 int bitmap_full(const unsigned long *bitmap, int bits);
 int bitmap_equal(const unsigned long *bitmap1,
-			unsigned long *bitmap2, int bits);
-void bitmap_complement(unsigned long *bitmap, int bits);
+			const unsigned long *bitmap2, int bits);
+void bitmap_complement(unsigned long *dst, const unsigned long *src, int bits);
 
 static inline void bitmap_zero(unsigned long *bitmap, int bits)
 {
@@ -41,6 +41,14 @@ void bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
 			const unsigned long *bitmap2, int bits);
 void bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
 			const unsigned long *bitmap2, int bits);
+void bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
+			const unsigned long *bitmap2, int bits);
+void bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
+			const unsigned long *bitmap2, int bits);
+int bitmap_intersects(const unsigned long *bitmap1,
+			const unsigned long *bitmap2, int bits);
+int bitmap_subset(const unsigned long *bitmap1,
+			const unsigned long *bitmap2, int bits);
 int bitmap_weight(const unsigned long *bitmap, int bits);
 int bitmap_scnprintf(char *buf, unsigned int buflen,
 			const unsigned long *maskp, int bits);