ktime_devns is an inline function for constant divisors. For
non-constant divisors, it's only inline for 64-bit systems and calls to
an out-of-line __ktime_divns function otherwise.
Implement the out-of-line function, so it's use of the function in
common code is portable.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
lib/math/div64.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/lib/math/div64.c b/lib/math/div64.c
index 386497592b0b..3d646c487b3d 100644
--- a/lib/math/div64.c
+++ b/lib/math/div64.c
@@ -21,6 +21,7 @@
#include <linux/bitops.h>
#include <module.h>
#include <linux/kernel.h>
+#include <linux/ktime.h>
#include <linux/math64.h>
#include <linux/log2.h>
@@ -233,3 +234,32 @@ u64 mul_u64_u64_div_u64(u64 a, u64 b, u64 c)
return res + div64_u64(a * b, c);
}
#endif
+
+/*
+ * Functions for the union type storage format of ktime_t which are
+ * too large for inlining:
+ */
+#if BITS_PER_LONG < 64
+/*
+ * Divide a ktime value by a nanosecond value
+ */
+s64 __ktime_divns(const ktime_t kt, s64 div)
+{
+ int sft = 0;
+ s64 dclc;
+ u64 tmp;
+
+ dclc = ktime_to_ns(kt);
+ tmp = dclc < 0 ? -dclc : dclc;
+
+ /* Make sure the divisor is less than 2^32: */
+ while (div >> 32) {
+ sft++;
+ div >>= 1;
+ }
+ tmp >>= sft;
+ do_div(tmp, (u32) div);
+ return dclc < 0 ? -tmp : tmp;
+}
+EXPORT_SYMBOL_GPL(__ktime_divns);
+#endif /* BITS_PER_LONG >= 64 */
--
2.39.2
