The DRC_INDEX_ID_MASK macro does a left shift on ~0, which is a signed
quantity, and therefore undefined behaviour according to the C spec. In
particular this causes warnings from the clang sanitizer.
This fixes it by calculating the same mask without using ~0 (I think the
new method is a more common idiom for generating masks anyway). For good
measure I also use 1ULL to force the expression's type to unsigned long
long, which should be good for assigning to anything we're going to want
to.
Reported-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
hw/ppc/spapr_drc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index ee87432..8cbcf4d 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -32,7 +32,7 @@
#define DRC_CONTAINER_PATH "/dr-connector"
#define DRC_INDEX_TYPE_SHIFT 28
-#define DRC_INDEX_ID_MASK (~(~0 << DRC_INDEX_TYPE_SHIFT))
+#define DRC_INDEX_ID_MASK ((1ULL << DRC_INDEX_TYPE_SHIFT) - 1)
static sPAPRDRConnectorTypeShift get_type_shift(sPAPRDRConnectorType type)
{
--
2.4.3
