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vt,console,kdb: automatically set kdb LINES variable

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The kernel console interface stores the number of lines it is
configured to use. The kdb debugger can greatly benefit by knowing how
many lines there are on the console for the pager functionality
without having the end user compile in the setting or have to
repeatedly change it at run time.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: David Airlie <airlied@linux.ie>
CC: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jason Wessel 2010-08-05 09:22:30 -05:00
parent b45cfba4e9
commit 81d4450732
3 changed files with 21 additions and 2 deletions
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17
drivers/char/vt.c
View File

@ -104,6 +104,7 @@
#include <linux/io.h>
#include <asm/system.h>
#include <linux/uaccess.h>
#include <linux/kdb.h>
#define MAX_NR_CON_DRIVER 16
@ -3442,6 +3443,22 @@ int con_debug_enter(struct vc_data *vc)
console_blanked = 0;
if (vc->vc_sw->con_debug_enter)
ret = vc->vc_sw->con_debug_enter(vc);
#ifdef CONFIG_KGDB_KDB
/* Set the initial LINES variable if it is not already set */
if (vc->vc_rows < 999) {
int linecount;
char lns[4];
const char *setargs[3] = {
"set",
"LINES",
lns,
};
if (kdbgetintenv(setargs[0], &linecount)) {
snprintf(lns, 4, "%i", vc->vc_rows);
kdb_set(2, setargs);
}
}
#endif /* CONFIG_KGDB_KDB */
return ret;
}
EXPORT_SYMBOL_GPL(con_debug_enter);

4
include/linux/kdb.h
View File

@ -114,4 +114,8 @@ enum {
KDB_INIT_EARLY,
KDB_INIT_FULL,
};
extern int kdbgetintenv(const char *, int *);
extern int kdb_set(int, const char **);
#endif /* !_KDB_H */

2
kernel/debug/kdb/kdb_private.h
View File

@ -144,9 +144,7 @@ extern int kdb_getword(unsigned long *, unsigned long, size_t);
extern int kdb_putword(unsigned long, unsigned long, size_t);
extern int kdbgetularg(const char *, unsigned long *);
extern int kdb_set(int, const char **);
extern char *kdbgetenv(const char *);
extern int kdbgetintenv(const char *, int *);
extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
long *, char **);
extern int kdbgetsymval(const char *, kdb_symtab_t *);