linux-kernel - [PATCH] selftests: timers: use 'llabs()' over 'abs()'

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Date:   Fri,  5 Nov 2021 17:34:03 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     shuah@...nel.org, tglx@...utronix.de, john.stultz@...aro.org
Cc:     nathan@...nel.org, ndesaulniers@...gle.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        llvm@...ts.linux.dev, Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH] selftests: timers: use 'llabs()' over 'abs()'

When building selftests/timers with clang, the compiler warn about the
function abs() see below:

posix_timers.c:69:6: warning: absolute value function 'abs' given an argument of type 'long long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
        if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
            ^
posix_timers.c:69:6: note: use function 'llabs' instead
        if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
            ^~~
            llabs

The note indicates what to do, Rework to use the function 'llabs()'.

Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 tools/testing/selftests/timers/posix_timers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/timers/posix_timers.c b/tools/testing/selftests/timers/posix_timers.c
index 337424c5c987..73fb27901a1d 100644
--- a/tools/testing/selftests/timers/posix_timers.c
+++ b/tools/testing/selftests/timers/posix_timers.c
@@ -66,7 +66,7 @@ static int check_diff(struct timeval start, struct timeval end)
 	diff = end.tv_usec - start.tv_usec;
 	diff += (end.tv_sec - start.tv_sec) * USECS_PER_SEC;
 
-	if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
+	if (llabs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
 		printf("Diff too high: %lld..", diff);
 		return -1;
 	}
-- 
2.33.0