ktime: add ktime_after and ktime_before helper

Add two minimal helper functions analogous to time_before() and
time_after() that will later on both be needed by SCTP code.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 25 insertions, 1 deletions

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 31c0cd1c941a..de9e46e6bcc9 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -304,6 +304,30 @@ static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
         return 0;
 }
 
+/**
+ * ktime_after - Compare if a ktime_t value is bigger than another one.
+ * @cmp1:       comparable1
+ * @cmp2:       comparable2
+ *
+ * Return: true if cmp1 happened after cmp2.
+ */
+static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
+{
+        return ktime_compare(cmp1, cmp2) > 0;
+}
+
+/**
+ * ktime_before - Compare if a ktime_t value is smaller than another one.
+ * @cmp1:       comparable1
+ * @cmp2:       comparable2
+ *
+ * Return: true if cmp1 happened before cmp2.
+ */
+static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)
+{
+        return ktime_compare(cmp1, cmp2) < 0;
+}
+
 static inline s64 ktime_to_us(const ktime_t kt)
 {
         struct timeval tv = ktime_to_timeval(kt);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index fee5552ddf92..ae0e616a7ca5 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1782,7 +1782,7 @@ no_hmac:
         else
                 kt = ktime_get();
 
-        if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) {
+        if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
                 /*
                  * Section 3.3.10.3 Stale Cookie Error (3)
                  *