mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-30 23:54:04 +08:00
7245d24f87
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>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Simple stack backtrace regression test module
|
|
*
|
|
* (C) Copyright 2008 Intel Corporation
|
|
* Author: Arjan van de Ven <arjan@linux.intel.com>
|
|
*/
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
|
|
static void backtrace_test_normal(void)
|
|
{
|
|
pr_info("Testing a backtrace from process context.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
dump_stack();
|
|
}
|
|
|
|
static void backtrace_test_bh_workfn(struct work_struct *work)
|
|
{
|
|
dump_stack();
|
|
}
|
|
|
|
static DECLARE_WORK(backtrace_bh_work, &backtrace_test_bh_workfn);
|
|
|
|
static void backtrace_test_bh(void)
|
|
{
|
|
pr_info("Testing a backtrace from BH context.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
queue_work(system_bh_wq, &backtrace_bh_work);
|
|
flush_work(&backtrace_bh_work);
|
|
}
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
static void backtrace_test_saved(void)
|
|
{
|
|
unsigned long entries[8];
|
|
unsigned int nr_entries;
|
|
|
|
pr_info("Testing a saved backtrace.\n");
|
|
pr_info("The following trace is a kernel self test and not a bug!\n");
|
|
|
|
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
|
|
stack_trace_print(entries, nr_entries, 0);
|
|
}
|
|
#else
|
|
static void backtrace_test_saved(void)
|
|
{
|
|
pr_info("Saved backtrace test skipped.\n");
|
|
}
|
|
#endif
|
|
|
|
static int backtrace_regression_test(void)
|
|
{
|
|
pr_info("====[ backtrace testing ]===========\n");
|
|
|
|
backtrace_test_normal();
|
|
backtrace_test_bh();
|
|
backtrace_test_saved();
|
|
|
|
pr_info("====[ end of backtrace testing ]====\n");
|
|
return 0;
|
|
}
|
|
|
|
static void exitf(void)
|
|
{
|
|
}
|
|
|
|
module_init(backtrace_regression_test);
|
|
module_exit(exitf);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
|