On 32-bit architectures, clang-tidy reports:
/home/pi/passt/tcp.c:728:11: error: performing an implicit widening conversion to type
'uint64_t' (aka 'unsigned long long') of a multiplication performed in
type 'unsigned long'
[bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
728 | if (v >= SNDBUF_BIG)
| ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
158 | #define SNDBUF_BIG (4UL * 1024 * 1024)
| ^
/home/pi/passt/tcp.c:728:11: note: make conversion explicit to silence this warning
728 | if (v >= SNDBUF_BIG)
| ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
158 | #define SNDBUF_BIG (4UL * 1024 * 1024)
| ^~~~~~~~~~~~~~~~~
/home/pi/passt/tcp.c:728:11: note: perform multiplication in a wider type
728 | if (v >= SNDBUF_BIG)
| ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
158 | #define SNDBUF_BIG (4UL * 1024 * 1024)
| ^~~~~~~~~~
/home/pi/passt/tcp.c:730:15: error: performing an implicit widening conversion to type
'uint64_t' (aka 'unsigned long long') of a multiplication performed in
type 'unsigned long'
[bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
730 | else if (v > SNDBUF_SMALL)
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^
/home/pi/passt/tcp.c:730:15: note: make conversion explicit to silence this warning
730 | else if (v > SNDBUF_SMALL)
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^~~~~~~~~~~~
/home/pi/passt/tcp.c:730:15: note: perform multiplication in a wider type
730 | else if (v > SNDBUF_SMALL)
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^~~~~
/home/pi/passt/tcp.c:731:17: error: performing an implicit widening conversion to type
'uint64_t' (aka 'unsigned long long') of a multiplication performed in
type 'unsigned long'
[bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
731 | v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^
/home/pi/passt/tcp.c:731:17: note: make conversion explicit to silence this warning
731 | v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^~~~~~~~~~~~
/home/pi/passt/tcp.c:731:17: note: perform multiplication in a wider type
731 | v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
| ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
159 | #define SNDBUF_SMALL (128UL * 1024)
| ^~~~~
because, wherever we use those thresholds, we define the other term
of comparison as uint64_t. Define the thresholds as unsigned long long
as well, to make sure we match types.
Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com>
---
util.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/util.h b/util.h
index 582ef57..963f57b 100644
--- a/util.h
+++ b/util.h
@@ -158,9 +158,9 @@ int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size,
int flags,
(void *)(arg)); \
} while (0)
-#define RCVBUF_BIG (2UL * 1024 * 1024)
-#define SNDBUF_BIG (4UL * 1024 * 1024)
-#define SNDBUF_SMALL (128UL * 1024)
+#define RCVBUF_BIG (2ULL * 1024 * 1024)
+#define SNDBUF_BIG (4ULL * 1024 * 1024)
+#define SNDBUF_SMALL (128ULL * 1024)
#include <net/if.h>
#include <limits.h>
--
2.43.0