From: Hans Holmberg Date: Tue, 9 Oct 2018 11:11:50 +0000 (+0200) Subject: lightnvm: pblk: fix write amplificiation calculation X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=765462fa4c4d0fd3eb718f2ba14cb04c35219854;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- 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",