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bitmap: New macro BITMAP_N_LONGS for use in constant expressions.

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An upcoming commit will declare a bitmap on the stack, rather than heap
allocating it, which means that it is not possible to use a function call
in the declaration.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2013-11-09 15:21:12 -08:00
parent c49a5e3308
commit 1af1ed8500
1 changed files with 4 additions and 2 deletions
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6
lib/bitmap.h
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@@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
* *
* Licensed under the Apache License, Version 2.0 (the "License"); * Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. * you may not use this file except in compliance with the License.
@@ -35,10 +35,12 @@ bitmap_bit__(size_t offset)
return 1UL << (offset % BITMAP_ULONG_BITS); return 1UL << (offset % BITMAP_ULONG_BITS);
} }
#define BITMAP_N_LONGS(N_BITS) DIV_ROUND_UP(N_BITS, BITMAP_ULONG_BITS)
static inline size_t static inline size_t
bitmap_n_longs(size_t n_bits) bitmap_n_longs(size_t n_bits)
{ {
return DIV_ROUND_UP(n_bits, BITMAP_ULONG_BITS); return BITMAP_N_LONGS(n_bits);
} }
static inline size_t static inline size_t