[PATCH] rv: Fix 32-bit build of nomiss KUnit test

[PATCH] rv: Fix 32-bit build of nomiss KUnit test

[Gabriele Monaco]

Commit 8da2a8838365 ("rv: Add KUnit tests for some DA/HA monitors")
introduced a division of a 64-bit value by 1000 in the nomiss KUnit
test. This does not compile on 32-bit systems, as standard division of
64-bit values leads to an undefined reference to __udivdi3.

Fix the build on 32-bit systems by using div_u64().

Fixes: 8da2a8838365 ("rv: Add KUnit tests for some DA/HA monitors")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202608020311.hYjqOG5k-lkp@intel.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
---
 kernel/trace/rv/monitors/nomiss/nomiss_kunit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/rv/monitors/nomiss/nomiss_kunit.c b/kernel/trace/rv/monitors/nomiss/nomiss_kunit.c
index 1f64249dfcce..763129e2a990 100644
--- a/kernel/trace/rv/monitors/nomiss/nomiss_kunit.c
+++ b/kernel/trace/rv/monitors/nomiss/nomiss_kunit.c
@@ -28,7 +28,7 @@ static void rv_test_nomiss(struct kunit *test)
 	udelay(10);
 	rv_nomiss_ops.handle_sched_switch(NULL, 0, target, other, TASK_RUNNING);
 	RV_KUNIT_EXPECT_REACTION_HERE(test, ctx) {
-		udelay(15 + *rv_nomiss_ops.deadline_thresh / 1000);
+		udelay(15 + div_u64(*rv_nomiss_ops.deadline_thresh, 1000));
 		rv_nomiss_ops.handle_sched_switch(NULL, 0, other, target, TASK_RUNNING);
 	}
 }

base-commit: 984b5a36fd12d1849511a45fda32036fe2b0d004
-- 
2.55.0

Re: [PATCH] rv: Fix 32-bit build of nomiss KUnit test

[Nam Cao]

Gabriele Monaco <gmonaco@redhat.com> writes:

> Commit 8da2a8838365 ("rv: Add KUnit tests for some DA/HA monitors")
> introduced a division of a 64-bit value by 1000 in the nomiss KUnit
> test. This does not compile on 32-bit systems, as standard division of
> 64-bit values leads to an undefined reference to __udivdi3.
>
> Fix the build on 32-bit systems by using div_u64().
>
> Fixes: 8da2a8838365 ("rv: Add KUnit tests for some DA/HA monitors")
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202608020311.hYjqOG5k-lkp@intel.com
> Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>

Reviewed-by: Nam Cao <namcao@linutronix.de>