linux-kernel - Re: [PATCH] Add initcall_blacklist kernel parameter [v5]

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Date:	Tue, 15 Apr 2014 13:04:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Richard Weinberger <richard.weinberger@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Rob Landley <rob@...dley.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH] Add initcall_blacklist kernel parameter [v5]

On Tue, 15 Apr 2014 11:15:58 -0400 Prarit Bhargava <prarit@...hat.com> wrote:

> When a module is built into the kernel the module_init() function becomes
> an initcall.  Sometimes debugging through dynamic debug can help,
> however, debugging built in kernel modules is typically done by changing
> the .config, recompiling, and booting the new kernel in an effort to
> determine exactly which module caused a problem.
> 
> This patchset can be useful stand-alone or combined with initcall_debug.
> There are cases where some initcalls can hang the machine before the
> console can be flushed, which can make initcall_debug output
> inaccurate.  Having the ability to skip initcalls can help further
> debugging of these scenarios.
> 
> Usage: initcall_blacklist=<list of comma separated initcalls>
> 
> ex) added "initcall_blacklist=sgi_uv_sysfs_init" as a kernel parameter and
> the log contains:
> 
> 	blacklisted initcall sgi_uv_sysfs_init

I think "blacklisting initcall sgi_uv_sysfs_init" makes more sense here.

> 	...
> 	...
> 	function sgi_uv_sysfs_init returning without executing

And this should be "blacklisted sgi_uv_sysfs_init initcall" or
"initcall sgi_uv_sysfs_init blacklisted" (isn't English weird).

I did the below and fixed up the changelog to suit:

--- a/init/main.c~init-mainc-add-initcall_blacklist-kernel-parameter-fix
+++ a/init/main.c
@@ -684,7 +684,7 @@ static int __init initcall_blacklist(cha
 	do {
 		str_entry = strsep(&str, ",");
 		if (str_entry) {
-			pr_debug("initcall blacklisted %s\n", str_entry);
+			pr_debug("blacklisting initcall %s\n", str_entry);
 			entry = alloc_bootmem(sizeof(*entry));
 			entry->buf = alloc_bootmem(strlen(str_entry) + 1);
 			strcpy(entry->buf, str_entry);
_

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