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backtracetest: Convert from tasklet to BH workqueue 

The only generic interface to execute asynchronously in the BH context is
tasklet; however, it's marked deprecated and has some design flaws. To
replace tasklets, BH workqueue support was recently added. A BH workqueue
behaves similarly to regular workqueues except that the queued work items
are executed in the BH context.

This patch converts backtracetest from tasklet to BH workqueue.

- Replace "irq" with "bh" in names and message to better reflect what's
  happening.

- Replace completion usage with a flush_work() call.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Tejun Heo 2024-02-04 11:34:28 -10:00
parent 8eb17dc1a6
commit 7245d24f87
1 changed files with 7 additions and 11 deletions
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18
kernel/backtracetest.c
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@ -21,24 +21,20 @@ static void backtrace_test_normal(void)
dump_stack();
}
static DECLARE_COMPLETION(backtrace_work);
static void backtrace_test_irq_callback(unsigned long data)
static void backtrace_test_bh_workfn(struct work_struct *work)
{
dump_stack();
complete(&backtrace_work);
}
static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
static DECLARE_WORK(backtrace_bh_work, &backtrace_test_bh_workfn);
static void backtrace_test_irq(void)
static void backtrace_test_bh(void)
{
pr_info("Testing a backtrace from irq context.\n");
pr_info("Testing a backtrace from BH context.\n");
pr_info("The following trace is a kernel self test and not a bug!\n");
init_completion(&backtrace_work);
tasklet_schedule(&backtrace_tasklet);
wait_for_completion(&backtrace_work);
queue_work(system_bh_wq, &backtrace_bh_work);
flush_work(&backtrace_bh_work);
}
#ifdef CONFIG_STACKTRACE
@ -65,7 +61,7 @@ static int backtrace_regression_test(void)
pr_info("====[ backtrace testing ]===========\n");
backtrace_test_normal();
backtrace_test_irq();
backtrace_test_bh();
backtrace_test_saved();
pr_info("====[ end of backtrace testing ]====\n");