Hi,
On Sun, Jan 24, 2021 at 11:06 PM Sumit Garg <sumit.g...@linaro.org> wrote:
>
> Simplify kdb commands registration via using linked list instead of
> static array for commands storage.
>
> Signed-off-by: Sumit Garg <sumit.g...@linaro.org>
> ---
>
> Changes in v2:
> - Remove redundant NULL check for "cmd_name".
> - Incorporate misc. comment.
>
> kernel/debug/kdb/kdb_main.c | 119
> ++++++++++++-----------------------------
> kernel/debug/kdb/kdb_private.h | 1 +
> 2 files changed, 34 insertions(+), 86 deletions(-)
>
> diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
> index 930ac1b..a0989a0 100644
> --- a/kernel/debug/kdb/kdb_main.c
> +++ b/kernel/debug/kdb/kdb_main.c
> @@ -33,6 +33,7 @@
> #include <linux/kallsyms.h>
> #include <linux/kgdb.h>
> #include <linux/kdb.h>
> +#include <linux/list.h>
> #include <linux/notifier.h>
> #include <linux/interrupt.h>
> #include <linux/delay.h>
> @@ -84,15 +85,8 @@ static unsigned int kdb_continue_catastrophic =
> static unsigned int kdb_continue_catastrophic;
> #endif
>
> -/* kdb_commands describes the available commands. */
> -static kdbtab_t *kdb_commands;
> -#define KDB_BASE_CMD_MAX 50
> -static int kdb_max_commands = KDB_BASE_CMD_MAX;
> -static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
> -#define for_each_kdbcmd(cmd, num) \
> - for ((cmd) = kdb_base_commands, (num) = 0; \
> - num < kdb_max_commands; \
> - num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
> +/* kdb_cmds_head describes the available commands. */
> +static LIST_HEAD(kdb_cmds_head);
>
> typedef struct _kdbmsg {
> int km_diag; /* kdb diagnostic */
> @@ -921,7 +915,7 @@ int kdb_parse(const char *cmdstr)
> char *cp;
> char *cpp, quoted;
> kdbtab_t *tp;
> - int i, escaped, ignore_errors = 0, check_grep = 0;
> + int escaped, ignore_errors = 0, check_grep = 0;
>
> /*
> * First tokenize the command string.
> @@ -1011,25 +1005,18 @@ int kdb_parse(const char *cmdstr)
> ++argv[0];
> }
>
> - for_each_kdbcmd(tp, i) {
> - if (tp->cmd_name) {
> - /*
> - * If this command is allowed to be abbreviated,
> - * check to see if this is it.
> - */
> -
> - if (tp->cmd_minlen
> - && (strlen(argv[0]) <= tp->cmd_minlen)) {
> - if (strncmp(argv[0],
> - tp->cmd_name,
> - tp->cmd_minlen) == 0) {
> - break;
> - }
> - }
> -
> - if (strcmp(argv[0], tp->cmd_name) == 0)
> + list_for_each_entry(tp, &kdb_cmds_head, list_node) {
> + /*
> + * If this command is allowed to be abbreviated,
> + * check to see if this is it.
> + */
> + if (tp->cmd_minlen && (strlen(argv[0]) <= tp->cmd_minlen)) {
> + if (strncmp(argv[0], tp->cmd_name, tp->cmd_minlen) ==
> 0)
> break;
> }
The old code had the same problem, but since you're touching it you could fix?
if (a) {
if (b)
break;
}
...is the same as:
if (a && b)
break;
In any case, this looks like quite a nice cleanup, so:
Reviewed-by: Douglas Anderson <diand...@chromium.org>
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