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