From: Alan Maguire alan.maguire@oracle.com

[ Upstream commit 1c024d45151b51c8f8d4749e65958b0bcf3e7c52 ]

In discussion of how to handle timeouts, it was noted that if sysctl_hung_task_timeout_seconds is exceeded for a kunit test, the test task will be killed and an oops generated. This should suffice as a means of debugging such timeout issues for now.

Hence remove use of sysctl_hung_task_timeout_secs, which has the added benefit of avoiding the need to export that symbol from the core kernel.

Co-developed-by: Knut Omang knut.omang@oracle.com Signed-off-by: Knut Omang knut.omang@oracle.com Signed-off-by: Alan Maguire alan.maguire@oracle.com Reviewed-by: Stephen Boyd sboyd@kernel.org Acked-by: Brendan Higgins brendanhiggins@google.com Signed-off-by: Shuah Khan skhan@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/kunit/try-catch.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-)

diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index 55686839eb619..6b9c5242017f6 100644 --- a/lib/kunit/try-catch.c +++ b/lib/kunit/try-catch.c @@ -12,7 +12,6 @@ #include <linux/completion.h> #include <linux/kernel.h> #include <linux/kthread.h> -#include <linux/sched/sysctl.h>

void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch) { @@ -31,8 +30,6 @@ static int kunit_generic_run_threadfn_adapter(void *data)

static unsigned long kunit_test_timeout(void) { - unsigned long timeout_msecs; - /* * TODO(brendanhiggins@google.com): We should probably have some type of * variable timeout here. The only question is what that timeout value @@ -49,22 +46,11 @@ static unsigned long kunit_test_timeout(void) * * For more background on this topic, see: * https://mike-bland.com/2011/11/01/small-medium-large.html + * + * If tests timeout due to exceeding sysctl_hung_task_timeout_secs, + * the task will be killed and an oops generated. */ - if (sysctl_hung_task_timeout_secs) { - /* - * If sysctl_hung_task is active, just set the timeout to some - * value less than that. - * - * In regards to the above TODO, if we decide on variable - * timeouts, this logic will likely need to change. - */ - timeout_msecs = (sysctl_hung_task_timeout_secs - 1) * - MSEC_PER_SEC; - } else { - timeout_msecs = 300 * MSEC_PER_SEC; /* 5 min */ - } - - return timeout_msecs; + return 300 * MSEC_PER_SEC; /* 5 min */ }

void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)