i386/kvm: Replace abs64() with uabs64() from host-utils

Drop abs64() and use uabs64() from host-utils, which avoids
an undefined behavior when taking abs of the most negative value.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210910112624.72748-5-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/i386/kvm/i8254.c b/hw/i386/kvm/i8254.c
index fa68669e8a597cd8e2cca5d238ec6a6b0e87f36c..191a26fa57eaa8a72190376e341cd29c440aba4e 100644 (file)
--- a/hw/i386/kvm/i8254.c
+++ b/hw/i386/kvm/i8254.c
@@ -59,11 +59,6 @@ struct KVMPITClass {
     DeviceRealize parent_realize;
 };
 
-static int64_t abs64(int64_t v)
-{
-    return v < 0 ? -v : v;
-}
-
 static void kvm_pit_update_clock_offset(KVMPITState *s)
 {
     int64_t offset, clock_offset;
@@ -81,7 +76,7 @@ static void kvm_pit_update_clock_offset(KVMPITState *s)
         clock_gettime(CLOCK_MONOTONIC, &ts);
         offset -= ts.tv_nsec;
         offset -= (int64_t)ts.tv_sec * 1000000000;
-        if (abs64(offset) < abs64(clock_offset)) {
+        if (uabs64(offset) < uabs64(clock_offset)) {
             clock_offset = offset;
         }
     }