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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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aad108aa9d
Add sample code to test trace_printk(). The trace_printk() functions should never be used in production code. This makes testing it a bit more difficult. Having a sample module that can test use cases of trace_printk() can help out. Currently it just tests trace_printk() where it will be converted into: trace_bputs() trace_puts() trace_bprintk() as well as staying as the normal _trace_printk(). It also tests its use in interrupt context as that will test the auxilery buffers. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/irq_work.h>
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/* Must not be static to force gcc to consider these non constant */
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char *trace_printk_test_global_str =
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"This is a dynamic string that will use trace_puts\n";
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char *trace_printk_test_global_str_irq =
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"(irq) This is a dynamic string that will use trace_puts\n";
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char *trace_printk_test_global_str_fmt =
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"%sThis is a %s that will use trace_printk\n";
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static struct irq_work irqwork;
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static void trace_printk_irq_work(struct irq_work *work)
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{
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trace_printk("(irq) This is a static string that will use trace_bputs\n");
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trace_printk(trace_printk_test_global_str_irq);
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trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
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"static string");
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trace_printk(trace_printk_test_global_str_fmt,
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"(irq) ", "dynamic string");
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}
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static int __init trace_printk_init(void)
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{
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init_irq_work(&irqwork, trace_printk_irq_work);
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trace_printk("This is a static string that will use trace_bputs\n");
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trace_printk(trace_printk_test_global_str);
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/* Kick off printing in irq context */
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irq_work_queue(&irqwork);
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trace_printk("This is a %s that will use trace_bprintk()\n",
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"static string");
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trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
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return 0;
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}
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static void __exit trace_printk_exit(void)
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{
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}
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module_init(trace_printk_init);
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module_exit(trace_printk_exit);
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MODULE_AUTHOR("Steven Rostedt");
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MODULE_DESCRIPTION("trace-printk");
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MODULE_LICENSE("GPL");
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