The kdb_defcmd can only be used to display the available command aliases while using the kernel debug shell. If you try to define a new macro while the kernel debugger is active it will oops. The debug shell macros must use pre-allocated memory set aside at the time kdb_init() is run, and the kdb_defcmd is restricted to only working at the time that the kdb_init sequence is being run, which only occurs if you actually activate the kernel debugger.
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| @@ -681,6 +681,10 @@ static int kdb_defcmd(int argc, const char **argv) · 680 unmodified lines | ||
| 681 | 681 | } |
| 682 | 682 | if (argc != 3) |
| 683 | 683 | return KDB_ARGCOUNT; |
| 684 | + if (in_dbg_master()) { | |
| 685 | + kdb_printf("Command only available during kdb_init()\n"); | |
| 686 | + return KDB_NOTIMP; | |
| 687 | + } | |
| 684 | 688 | defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set), |
| 685 | 689 | GFP_KDB); |
| 686 | 690 | if (!defcmd_set) |
| @@ -2796,8 +2800,8 @@ static void __init kdb_inittab(void) · 2109 unmodified lines | ||
| 2796 | 2800 | "Stack traceback", 1, KDB_REPEAT_NONE); |
| 2797 | 2801 | kdb_register_repeat("btp", kdb_bt, "<pid>", |
| 2798 | 2802 | "Display stack for process <pid>", 0, KDB_REPEAT_NONE); |
| 2799 | − kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]", | |
| 2800 | − "Display stack all processes", 0, KDB_REPEAT_NONE); | |
| 2803 | + kdb_register_repeat("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]", | |
| 2804 | + "Backtrace all processes matching state flag", 0, KDB_REPEAT_NONE); | |
| 2801 | 2805 | kdb_register_repeat("btc", kdb_bt, "", |
| 2802 | 2806 | "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE); |
| 2803 | 2807 | kdb_register_repeat("btt", kdb_bt, "<vaddr>", |