diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/find_last_bit.c | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/lib/find_last_bit.c b/lib/find_last_bit.c deleted file mode 100644 index 3e3be40c6a6e..000000000000 --- a/lib/find_last_bit.c +++ /dev/null | |||
@@ -1,41 +0,0 @@ | |||
1 | /* find_last_bit.c: fallback find next bit implementation | ||
2 | * | ||
3 | * Copyright (C) 2008 IBM Corporation | ||
4 | * Written by Rusty Russell <rusty@rustcorp.com.au> | ||
5 | * (Inspired by David Howell's find_next_bit implementation) | ||
6 | * | ||
7 | * Rewritten by Yury Norov <yury.norov@gmail.com> to decrease | ||
8 | * size and improve performance, 2015. | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or | ||
11 | * modify it under the terms of the GNU General Public License | ||
12 | * as published by the Free Software Foundation; either version | ||
13 | * 2 of the License, or (at your option) any later version. | ||
14 | */ | ||
15 | |||
16 | #include <linux/bitops.h> | ||
17 | #include <linux/bitmap.h> | ||
18 | #include <linux/export.h> | ||
19 | #include <linux/kernel.h> | ||
20 | |||
21 | #ifndef find_last_bit | ||
22 | |||
23 | unsigned long find_last_bit(const unsigned long *addr, unsigned long size) | ||
24 | { | ||
25 | if (size) { | ||
26 | unsigned long val = BITMAP_LAST_WORD_MASK(size); | ||
27 | unsigned long idx = (size-1) / BITS_PER_LONG; | ||
28 | |||
29 | do { | ||
30 | val &= addr[idx]; | ||
31 | if (val) | ||
32 | return idx * BITS_PER_LONG + __fls(val); | ||
33 | |||
34 | val = ~0ul; | ||
35 | } while (idx--); | ||
36 | } | ||
37 | return size; | ||
38 | } | ||
39 | EXPORT_SYMBOL(find_last_bit); | ||
40 | |||
41 | #endif | ||