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authorHans Holmberg <hans.holmberg@cnexlabs.com>2018-10-09 13:11:50 +0200
committerJens Axboe <axboe@kernel.dk>2018-10-09 08:25:07 -0600
commit765462fa4c4d0fd3eb718f2ba14cb04c35219854 (patch)
treeb97d875ef5463cc92466dca93681cca2798edc0c /drivers/lightnvm
parentea1d24bc3ac0a0a544db0686d1ff8bb0c31ad683 (diff)
lightnvm: pblk: fix write amplificiation calculation
When the user data counter exceeds 32 bits, the write amplification calculation does not provide the right value. Fix this by using div64_u64 in stead of div64. Fixes: 76758390f83e ("lightnvm: pblk: export write amplification counters to sysfs") Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/pblk-sysfs.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c
index 9fc3dfa168b4..e56eeeeb914e 100644
--- a/drivers/lightnvm/pblk-sysfs.c
+++ b/drivers/lightnvm/pblk-sysfs.c
@@ -337,7 +337,6 @@ static ssize_t pblk_get_write_amp(u64 user, u64 gc, u64 pad,
{
int sz;
-
sz = snprintf(page, PAGE_SIZE,
"user:%lld gc:%lld pad:%lld WA:",
user, gc, pad);
@@ -349,7 +348,7 @@ static ssize_t pblk_get_write_amp(u64 user, u64 gc, u64 pad,
u32 wa_frac;
wa_int = (user + gc + pad) * 100000;
- wa_int = div_u64(wa_int, user);
+ wa_int = div64_u64(wa_int, user);
wa_int = div_u64_rem(wa_int, 100000, &wa_frac);
sz += snprintf(page + sz, PAGE_SIZE - sz, "%llu.%05u\n",