mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
1c024d4515
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>
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* An API to allow a function, that may fail, to be executed, and recover in a
|
|
* controlled manner.
|
|
*
|
|
* Copyright (C) 2019, Google LLC.
|
|
* Author: Brendan Higgins <brendanhiggins@google.com>
|
|
*/
|
|
|
|
#include <kunit/test.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kthread.h>
|
|
|
|
#include "try-catch-impl.h"
|
|
|
|
void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
|
|
{
|
|
try_catch->try_result = -EFAULT;
|
|
complete_and_exit(try_catch->try_completion, -EFAULT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kunit_try_catch_throw);
|
|
|
|
static int kunit_generic_run_threadfn_adapter(void *data)
|
|
{
|
|
struct kunit_try_catch *try_catch = data;
|
|
|
|
try_catch->try(try_catch->context);
|
|
|
|
complete_and_exit(try_catch->try_completion, 0);
|
|
}
|
|
|
|
static unsigned long kunit_test_timeout(void)
|
|
{
|
|
/*
|
|
* TODO(brendanhiggins@google.com): We should probably have some type of
|
|
* variable timeout here. The only question is what that timeout value
|
|
* should be.
|
|
*
|
|
* The intention has always been, at some point, to be able to label
|
|
* tests with some type of size bucket (unit/small, integration/medium,
|
|
* large/system/end-to-end, etc), where each size bucket would get a
|
|
* default timeout value kind of like what Bazel does:
|
|
* https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
|
|
* There is still some debate to be had on exactly how we do this. (For
|
|
* one, we probably want to have some sort of test runner level
|
|
* timeout.)
|
|
*
|
|
* 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.
|
|
*/
|
|
return 300 * MSEC_PER_SEC; /* 5 min */
|
|
}
|
|
|
|
void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(try_completion);
|
|
struct kunit *test = try_catch->test;
|
|
struct task_struct *task_struct;
|
|
int exit_code, time_remaining;
|
|
|
|
try_catch->context = context;
|
|
try_catch->try_completion = &try_completion;
|
|
try_catch->try_result = 0;
|
|
task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
|
|
try_catch,
|
|
"kunit_try_catch_thread");
|
|
if (IS_ERR(task_struct)) {
|
|
try_catch->catch(try_catch->context);
|
|
return;
|
|
}
|
|
|
|
time_remaining = wait_for_completion_timeout(&try_completion,
|
|
kunit_test_timeout());
|
|
if (time_remaining == 0) {
|
|
kunit_err(test, "try timed out\n");
|
|
try_catch->try_result = -ETIMEDOUT;
|
|
}
|
|
|
|
exit_code = try_catch->try_result;
|
|
|
|
if (!exit_code)
|
|
return;
|
|
|
|
if (exit_code == -EFAULT)
|
|
try_catch->try_result = 0;
|
|
else if (exit_code == -EINTR)
|
|
kunit_err(test, "wake_up_process() was never called\n");
|
|
else if (exit_code)
|
|
kunit_err(test, "Unknown error: %d\n", exit_code);
|
|
|
|
try_catch->catch(try_catch->context);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kunit_try_catch_run);
|