[LTP] [PATCH] epoll_wait04: Use tst_multiply_timeout()

[LTP] [PATCH] epoll_wait04: Use tst_multiply_timeout()

[Florian Schmaus via ltp]

On slow or emulated systems, epoll_wait04 can produce false positives
like:

epoll_wait04.c:36: TFAIL: epoll_wait() waited for 1106us with a timeout equal to zero

Avoid this by scaling the scheduling delay threshold with
tst_multiply_timeout(), which respects LTP_TIMEOUT_MUL and slow kernel
configurations.

Signed-off-by: Florian Schmaus <florian.schmaus@codasip.com>
---
 testcases/kernel/syscalls/epoll_wait/epoll_wait04.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/epoll_wait/epoll_wait04.c b/testcases/kernel/syscalls/epoll_wait/epoll_wait04.c
index 5c4a545471b2..74af77a6fb19 100644
--- a/testcases/kernel/syscalls/epoll_wait/epoll_wait04.c
+++ b/testcases/kernel/syscalls/epoll_wait/epoll_wait04.c
@@ -29,7 +29,7 @@ static void run(void)
 	if (TST_RET != 0)
 		tst_res(TFAIL | TTERRNO, "epoll_wait() returned %li", TST_RET);
 
-	if (tst_timer_elapsed_us() <= USEC_PRECISION)
+	if (tst_timer_elapsed_us() <= tst_multiply_timeout(USEC_PRECISION))
 		tst_res(TPASS, "epoll_wait() returns immediately with a timeout equal to zero");
 	else
 		tst_res(TFAIL, "epoll_wait() waited for %llius with a timeout equal to zero",
-- 
2.55.0


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Re: [LTP] epoll_wait04: Use tst_multiply_timeout()

[linuxtestproject.agent]

Hi Florian,

On Mon Sep 28 17:30:58 2026 +0200, Florian Schmaus wrote:
> epoll_wait04: Use tst_multiply_timeout()

Verdict - Reviewed

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH] epoll_wait04: Use tst_multiply_timeout()

[Andrea Cervesato via ltp]

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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Re: [LTP] [PATCH] epoll_wait04: Use tst_multiply_timeout()

[Andrea Cervesato via ltp]

Merged, Thanks!

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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