include/linux/lcm.h

#ifndef _LCM_H
#define _LCM_H

#include <linux/compiler.h>

unsigned long lcm(unsigned long a, unsigned long b) __attribute_const__;

#endif /* _LCM_H */
block: Fix overrun in lcm() and move it to lib lcm() was defined to take integer-sized arguments. The supplied arguments are multiplied, however, causing us to overflow given sufficiently large input. That in turn led to incorrect optimal I/O size reporting in some cases (RAID over RAID). Switch lcm() over to unsigned long similar to gcd() and move the function from blk-settings.c to lib. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> 2010-03-15 12:46:51 +01:00			`#ifndef _LCM_H`
			`#define _LCM_H`

			`#include <linux/compiler.h>`

			`unsigned long lcm(unsigned long a, unsigned long b) __attribute_const__;`

			`#endif /* _LCM_H */`