summaryrefslogtreecommitdiff
path: root/include/linux/math64.h
diff options
context:
space:
mode:
authorHaozhong Zhang <haozhong.zhang@intel.com>2015-10-20 15:39:04 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2015-11-10 12:06:16 +0100
commit381d585c80e34988269bd7901ad910981e900be1 (patch)
tree771900b748040495069fdad4c517f658159e3d6c /include/linux/math64.h
parent35181e86df97e4223f4a28fb33e2bcf3b73de141 (diff)
KVM: x86: Replace call-back set_tsc_khz() with a common function
Both VMX and SVM propagate virtual_tsc_khz in the same way, so this patch removes the call-back set_tsc_khz() and replaces it with a common function. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/math64.h')
-rw-r--r--include/linux/math64.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/math64.h b/include/linux/math64.h
index 44282ec7b682..6e8b5b270ffe 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -214,4 +214,33 @@ static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
#endif
+#ifndef mul_u64_u32_div
+static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
+{
+ union {
+ u64 ll;
+ struct {
+#ifdef __BIG_ENDIAN
+ u32 high, low;
+#else
+ u32 low, high;
+#endif
+ } l;
+ } u, rl, rh;
+
+ u.ll = a;
+ rl.ll = (u64)u.l.low * mul;
+ rh.ll = (u64)u.l.high * mul + rl.l.high;
+
+ /* Bits 32-63 of the result will be in rh.l.low. */
+ rl.l.high = do_div(rh.ll, divisor);
+
+ /* Bits 0-31 of the result will be in rl.l.low. */
+ do_div(rl.ll, divisor);
+
+ rl.l.high = rh.l.low;
+ return rl.ll;
+}
+#endif /* mul_u64_u32_div */
+
#endif /* _LINUX_MATH64_H */