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| author | Wen Yang <wenyang@linux.alibaba.com> | 2020-01-03 23:54:58 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-01-07 12:42:56 +0100 |
| commit | 809ed78a832df8b4ef81fee03570566c8f088f3a (patch) | |
| tree | f6d2756479859f245c57e13cbb045bf637d38832 /kernel | |
| parent | e976eb4b91e906f20ec25b20c152d53c472fc3fd (diff) | |
| download | linux-stable-809ed78a832df8b4ef81fee03570566c8f088f3a.tar.gz linux-stable-809ed78a832df8b4ef81fee03570566c8f088f3a.tar.bz2 linux-stable-809ed78a832df8b4ef81fee03570566c8f088f3a.zip | |
PM: hibernate: improve arithmetic division in preallocate_highmem_fraction()
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/snapshot.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 26b9168321e7..8a6eaf7367f3 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -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, |