[PATCH v2] KVM: selftests: hyperv_tlb_flush: use swap() to swap PTEs

[Piotr Zarycki]

Replace the open-coded swap with the swap() macro.

Signed-off-by: Piotr Zarycki <piotr.zary...@gmail.com>
---
 tools/include/linux/kernel.h                       | 4 ++++
 tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c | 6 +-----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/include/linux/kernel.h b/tools/include/linux/kernel.h
index c8c18d3908a9..381e457960dc 100644
--- a/tools/include/linux/kernel.h
+++ b/tools/include/linux/kernel.h
@@ -46,6 +46,10 @@
 #define min_t(type, x, y)      min((type)x, (type)y)
 #define clamp(val, lo, hi)     min((typeof(val))max(val, lo), hi)
 
+#ifndef swap
+#define swap(a, b)  do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } 
while (0)
+#endif
+
 #ifndef BUG_ON
 #ifdef NDEBUG
 #define BUG_ON(cond) do { if (cond) {} } while (0)
diff --git a/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c 
b/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c
index 15ee8b7bfc11..514d41f00714 100644
--- a/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c
+++ b/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c
@@ -131,14 +131,10 @@ static void set_expected_val(void *addr, u64 val, int 
vcpu_id)
 
 /*
  * Update PTEs swapping two test pages.
- * TODO: use swap()/xchg() when these are provided.
  */
 static void swap_two_test_pages(gpa_t pte_gva1, gpa_t pte_gva2)
 {
-       u64 tmp = *(u64 *)pte_gva1;
-
-       *(u64 *)pte_gva1 = *(u64 *)pte_gva2;
-       *(u64 *)pte_gva2 = tmp;
+       swap(*(u64 *)pte_gva1, *(u64 *)pte_gva2);
 }
 
 /*
-- 
2.54.0