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Subject[PATCH 15/16] dynamic_debug: init with early_initcall, not arch_initcall
From: Jim Cromie <>

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 <>
lib/dynamic_debug.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 7eb7a55..f7ba216 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1037,7 +1037,7 @@ out_err:
return 0;
/* Allow early initialization for boot messages via boot param */

/* Debugfs setup must be done later */

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