diff options
author | Thomas Renninger <trenn@suse.de> | 2010-08-06 10:11:02 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 13:16:42 -0400 |
commit | a648ec05bb950fae2f35d0490ddd6cf15010af72 (patch) | |
tree | cde3ca36db486e51d85c31619bf67f8d60215179 /lib/dynamic_debug.c | |
parent | fd89cfb8718753459fcea3fe6103d19de5e86c9b (diff) |
Dynamic Debug: Introduce ddebug_query= boot parameter
Dynamic debug lacks the ability to enable debug messages at boot time.
One could patch initramfs or service startup scripts to write to
/sys/../dynamic_debug/control, but this sucks.
This patch makes it possible to pass a query in the same format one can
write to /sys/../dynamic_debug/control via boot param.
When dynamic debug gets initialized, this query will automatically be
applied.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: jbaron@redhat.com
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib/dynamic_debug.c')
-rw-r--r-- | lib/dynamic_debug.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 84d103c474e4..44ce66bdb211 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c | |||
@@ -450,6 +450,19 @@ static int ddebug_exec_query(char *query_string) | |||
450 | return 0; | 450 | return 0; |
451 | } | 451 | } |
452 | 452 | ||
453 | static __initdata char ddebug_setup_string[1024]; | ||
454 | static __init int ddebug_setup_query(char *str) | ||
455 | { | ||
456 | if (strlen(str) >= 1024) { | ||
457 | pr_warning("ddebug boot param string too large\n"); | ||
458 | return 0; | ||
459 | } | ||
460 | strcpy(ddebug_setup_string, str); | ||
461 | return 1; | ||
462 | } | ||
463 | |||
464 | __setup("ddebug_query=", ddebug_setup_query); | ||
465 | |||
453 | /* | 466 | /* |
454 | * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the | 467 | * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the |
455 | * command text from userspace, parses and executes it. | 468 | * command text from userspace, parses and executes it. |
@@ -769,6 +782,18 @@ static int __init dynamic_debug_init(void) | |||
769 | } | 782 | } |
770 | ret = ddebug_add_module(iter_start, n, modname); | 783 | ret = ddebug_add_module(iter_start, n, modname); |
771 | } | 784 | } |
785 | |||
786 | /* ddebug_query boot param got passed -> set it up */ | ||
787 | if (ddebug_setup_string[0] != '\0') { | ||
788 | ret = ddebug_exec_query(ddebug_setup_string); | ||
789 | if (ret) | ||
790 | pr_warning("Invalid ddebug boot param %s", | ||
791 | ddebug_setup_string); | ||
792 | else | ||
793 | pr_info("ddebug initialized with string %s", | ||
794 | ddebug_setup_string); | ||
795 | } | ||
796 | |||
772 | out_free: | 797 | out_free: |
773 | if (ret) { | 798 | if (ret) { |
774 | ddebug_remove_all_tables(); | 799 | ddebug_remove_all_tables(); |