android_kernel_xiaomi_sm8350/include/linux/lcm.h
Martin K. Petersen 2cda2728aa 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 12:47:59 +01:00

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C

#ifndef _LCM_H
#define _LCM_H
#include <linux/compiler.h>
unsigned long lcm(unsigned long a, unsigned long b) __attribute_const__;
#endif /* _LCM_H */