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Message-ID: <20080204055540.GA11435@uranus.ravnborg.org>
Date: Mon, 4 Feb 2008 06:55:40 +0100
From: Sam Ravnborg <sam@...nborg.org>
To: Peter Teoh <htmldeveloper@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: Section mismatch: kernel/workqueue.c
On Mon, Feb 04, 2008 at 10:57:18AM +0800, Peter Teoh wrote:
> During compilation of the linus tree the following warnings are encountered:
>
> WARNING: kernel/built-in.o(.data+0x2480): Section mismatch in
> reference from the variable workqueue_cpu_callback_nb.14223 to the
> function .devinit.text:workqueue_cpu_callback()
> The variable workqueue_cpu_callback_nb.14223 references
> the function __devinit workqueue_cpu_callback()
> If the reference is valid then annotate the
> variable with __init* (see linux/init.h) or name the variable:
> *driver, *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console,
>
> This fix is to correct the following warning during compilation.
> Based on my "elementary" analysis, as it is called from other
> non-__init functions, this function cannot be declared as __devinit(),
> correct? Please comment. Thanks :-).
>
> Signed-off-by: Peter Teoh <htmldeveloper@...il.com>
Hi Peter.
I changed this and the following warning from relay using following
patch.
Sam
>From 5fc28317ea634483360c43b015f230c68ad2c0f4 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@...nborg.org>
Date: Thu, 31 Jan 2008 21:16:16 +0100
Subject: [PATCH] cpu: silence section mismatch warnings for hotcpu notifies
The hotcpu_notifier is used to create notifiers to be called later.
It really looks like the functions that are registered are only
relevant in a HOTPLUG_CPU configuration and the correct fix was
to wrap them in an #ifdef / #endif or similar.
But for now just tell modpost to silence the warning by annotating
the static variable with __refdata.
This silences the following warnings in kernel/:
WARNING: o-x86_64/kernel/built-in.o(.data+0x960): Section mismatch in reference from the variable profile_cpu_callback_nb.17240 to the function .devinit.text:profile_cpu_callback()
WARNING: o-x86_64/kernel/built-in.o(.data+0x3fa0): Section mismatch in reference from the variable workqueue_cpu_callback_nb.14663 to the function .devinit.text:workqueue_cpu_callback()
WARNING: o-x86_64/kernel/built-in.o(.data+0xe280): Section mismatch in reference from the variable relay_hotcpu_callback_nb.19247 to the function .cpuinit.text:relay_hotcpu_callback()
Additional warnings are silenced with this change but
they are left put.
This patch is just a workaround for the bad practice
to use __cpuinit to annotate code solely used for
HOTPLUG_CPU.
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Cc: Gautham R Shenoy <ego@...ibm.com>
---
include/linux/cpu.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 0be8d65..cebb8c0 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -109,7 +109,7 @@ static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
extern void get_online_cpus(void);
extern void put_online_cpus(void);
#define hotcpu_notifier(fn, pri) { \
- static struct notifier_block fn##_nb = \
+ static struct notifier_block fn##_nb __refdata = \
{ .notifier_call = fn, .priority = pri }; \
register_cpu_notifier(&fn##_nb); \
}
--
1.5.4.rc3.14.g44397
--
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