GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-23 15:11:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Dynamic Debug: Introduce ddebug_query= boot parameter

Browse source 
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>
This commit is contained in:
Thomas Renninger 2010-08-06 16:11:02 +02:00 • committed by Greg Kroah-Hartman
parent fd89cfb871
commit a648ec05bb
3 changed files with 52 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

25
lib/dynamic_debug.c
View file

@ -450,6 +450,19 @@ static int ddebug_exec_query(char *query_string)
return 0;
}
static __initdata char ddebug_setup_string[1024];
static __init int ddebug_setup_query(char *str)
{
if (strlen(str) >= 1024) {
pr_warning("ddebug boot param string too large\n");
return 0;
}
strcpy(ddebug_setup_string, str);
return 1;
}
__setup("ddebug_query=", ddebug_setup_query);
/*
* File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the
* command text from userspace, parses and executes it.
@ -769,6 +782,18 @@ static int __init dynamic_debug_init(void)
}
ret = ddebug_add_module(iter_start, n, modname);
}
/* ddebug_query boot param got passed -> set it up */
if (ddebug_setup_string[0] != '\0') {
ret = ddebug_exec_query(ddebug_setup_string);
if (ret)
pr_warning("Invalid ddebug boot param %s",
ddebug_setup_string);
else
pr_info("ddebug initialized with string %s",
ddebug_setup_string);
}
out_free:
if (ret) {
ddebug_remove_all_tables();