diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/lib/bitstr.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/x86_64/lib/bitstr.c')
-rw-r--r-- | arch/x86_64/lib/bitstr.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86_64/lib/bitstr.c b/arch/x86_64/lib/bitstr.c new file mode 100644 index 00000000000..24676609a6a --- /dev/null +++ b/arch/x86_64/lib/bitstr.c @@ -0,0 +1,28 @@ +#include <linux/module.h> +#include <linux/bitops.h> + +/* Find string of zero bits in a bitmap */ +unsigned long +find_next_zero_string(unsigned long *bitmap, long start, long nbits, int len) +{ + unsigned long n, end, i; + + again: + n = find_next_zero_bit(bitmap, nbits, start); + if (n == -1) + return -1; + + /* could test bitsliced, but it's hardly worth it */ + end = n+len; + if (end >= nbits) + return -1; + for (i = n+1; i < end; i++) { + if (test_bit(i, bitmap)) { + start = i+1; + goto again; + } + } + return n; +} + +EXPORT_SYMBOL(find_next_zero_string); |