801916c1b3
Fix an off-by-one error in find_next_zero_string which prevents allocating the last bit. [ tglx: arch/x86 adaptation ] Signed-off-by: Andrew Hastings <abh@cray.com> on behalf of Cray Inc. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
28 lines
563 B
C
28 lines
563 B
C
#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);
|