On Tue, 2016-09-27 at 03:42 -0400, Vishwanath Pai wrote:
quoted hunk ↗ jump to hunk
Fix link error in 32bit arch because of 64bit division
Division of 64bit integers will cause linker error undefined reference
to `__udivdi3'. Fix this by replacing divisions with div64_64
Signed-off-by: Vishwanath Pai <redacted>
---
net/netfilter/xt_hashlimit.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 44a095e..7fc694e 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -465,19 +465,20 @@ static u64 user2credits(u64 user, int revision)
{
if (revision == 1) {
/* If multiplying would overflow... */
- if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1))
+ if (user > div64_u64(0xFFFFFFFF, (HZ*CREDITS_PER_JIFFY_v1)))
How can this be needed ? 0xFFFFFFFF is 32bits, compiler knows how to
compute 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1) itself, without using a
64 bit divide !
Please be selective.
quoted hunk ↗ jump to hunk
/* Divide first. */
- return (user / XT_HASHLIMIT_SCALE) *\
+ return div64_u64(user, XT_HASHLIMIT_SCALE) *\
HZ * CREDITS_PER_JIFFY_v1;
- return (user * HZ * CREDITS_PER_JIFFY_v1) \
- / XT_HASHLIMIT_SCALE;
+ return div64_u64((user * HZ * CREDITS_PER_JIFFY_v1),
+ XT_HASHLIMIT_SCALE);
} else {
- if (user > 0xFFFFFFFFFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
- return (user / XT_HASHLIMIT_SCALE_v2) *\
Probably same remark here.
quoted hunk ↗ jump to hunk
+ if (user > div64_u64(0xFFFFFFFFFFFFFFFF, (HZ*CREDITS_PER_JIFFY)))
+ return div64_u64(user, XT_HASHLIMIT_SCALE_v2) *\
HZ * CREDITS_PER_JIFFY;
- return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE_v2;
+ return div64_u64((user * HZ * CREDITS_PER_JIFFY),
+ XT_HASHLIMIT_SCALE_v2);
}
}