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PM: hibernate: improve arithmetic division in preallocate_highmem_fraction()

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do_div() does a 64-by-32 division. Use div64_u64() instead of
do_div() if the divisor is u64, to avoid truncation to 32-bit.

This change also cleans up code a tad.

Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Wen Yang 2020-01-03 23:54:58 +08:00 committed by Rafael J. Wysocki
parent e976eb4b91
commit 809ed78a83
1 changed files with 1 additions and 3 deletions
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4
kernel/power/snapshot.c
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@ -1566,9 +1566,7 @@ static unsigned long preallocate_image_highmem(unsigned long nr_pages)
*/
static unsigned long __fraction(u64 x, u64 multiplier, u64 base)
{
x *= multiplier;
do_div(x, base);
return (unsigned long)x;
return div64_u64(x * multiplier, base);
}
static unsigned long preallocate_highmem_fraction(unsigned long nr_pages,