AcoSail/kernel_optimize_test
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dynamic_debug: init with early_initcall, not arch_initcall

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1- Call dynamic_debug_init() from early_initcall, not arch_initcall.
2- Call dynamic_debug_init_debugfs() from fs_initcall, not module_init.

RFC: This works for me on a 64 bit desktop and a i586 SBC, but is
untested on other arches.  I presume there is or was a reason
original code used arch_initcall, maybe the constraints have changed.

This makes facility available as soon as possible.

2nd change has a downside when dynamic_debug.verbose=1; all the
vpr_info()s called in the proc-fs code are activated, causing
voluminous output from dmesg.  TBD: Im unsure of this explanation, but
the output is there.  This could be fixed by changing those callsites
to v2pr_info(if verbose > 1).

1st change is still not early enough to enable pr_debugs in
kernel/params, so parsing of boot-args isnt logged.  The reparse of
those args is however visible after params.dyndbg="+p" is processed.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2012-04-27 14:30:42 -06:00 committed by Greg Kroah-Hartman
parent 29e36c9ffb
commit 3ec5652ab7
1 changed files with 2 additions and 2 deletions
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4
lib/dynamic_debug.c
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@ -1042,7 +1042,7 @@ static int __init dynamic_debug_init(void)
return 0;
}
/* Allow early initialization for boot messages via boot param */
arch_initcall(dynamic_debug_init);
early_initcall(dynamic_debug_init);
/* Debugfs setup must be done later */
module_init(dynamic_debug_init_debugfs);
fs_initcall(dynamic_debug_init_debugfs);