forked from mirrors/linux
683263a5e0
Provide a simple module to allow testing DYNAMIC_DEBUG behavior. It calls do_prints() from module-init, and with a sysfs-node. dmesg -C dmesg -w & modprobe test_dynamic_debug dyndbg=+p echo 1 > /sys/module/dynamic_debug/parameters/verbose cat /sys/module/test_dynamic_debug/parameters/do_prints echo module test_dynamic_debug +mftl > /proc/dynamic_debug/control echo junk > /sys/module/test_dynamic_debug/parameters/do_prints Acked-by: Jason Baron <jbaron@akamai.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Link: https://lore.kernel.org/r/20220904214134.408619-9-jim.cromie@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Kernel module for testing dynamic_debug
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*
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* Authors:
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* Jim Cromie <jim.cromie@gmail.com>
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*/
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#define pr_fmt(fmt) "test_dd: " fmt
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#include <linux/module.h>
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static void do_prints(void); /* device under test */
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/* run tests by reading or writing sysfs node */
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static int param_set_do_prints(const char *instr, const struct kernel_param *kp)
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{
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do_prints();
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return 0;
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}
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static int param_get_do_prints(char *buffer, const struct kernel_param *kp)
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{
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do_prints();
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return scnprintf(buffer, PAGE_SIZE, "did do_prints\n");
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}
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static const struct kernel_param_ops param_ops_do_prints = {
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.set = param_set_do_prints,
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.get = param_get_do_prints,
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};
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module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600);
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static void do_alpha(void)
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{
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pr_debug("do alpha\n");
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}
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static void do_beta(void)
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{
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pr_debug("do beta\n");
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}
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static void do_prints(void)
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{
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do_alpha();
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do_beta();
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}
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static int __init test_dynamic_debug_init(void)
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{
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pr_debug("init start\n");
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do_prints();
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pr_debug("init done\n");
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return 0;
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}
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static void __exit test_dynamic_debug_exit(void)
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{
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pr_debug("exiting\n");
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}
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module_init(test_dynamic_debug_init);
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module_exit(test_dynamic_debug_exit);
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MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
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MODULE_LICENSE("GPL");
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