linux-kernel - Re: [PATCH] kernel/module: silence a gcc warning

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Message-ID: <20180416171106.rlm2nrvrxfoodcvf@redbean>
Date:   Mon, 16 Apr 2018 19:11:06 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/module: silence a gcc warning

+++ Mathieu Malaterre [11/04/18 21:05 +0200]:
>In commit 8c8ef42aee8f ("module: include other structures in module version
>check"), the function `struct_module` was renamed to `module_layout` but no
>prototype was added to `include/linux/module.h`. Remove warning triggered
>at W=1:
>
>  kernel/module.c:4378:6: warning: no previous prototype for ‘module_layout’ [-Wmissing-prototypes]
>
>Signed-off-by: Mathieu Malaterre <malat@...ian.org>
>---
> include/linux/module.h | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
>diff --git a/include/linux/module.h b/include/linux/module.h
>index d44df9b2c131..28046e8b7e9d 100644
>--- a/include/linux/module.h
>+++ b/include/linux/module.h
>@@ -786,6 +786,14 @@ extern int module_sysfs_initialized;
>
> #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
>
>+#ifdef CONFIG_MODVERSIONS
>+void module_layout(struct module *mod,
>+		   struct modversion_info *ver,
>+		   struct kernel_param *kp,
>+		   struct kernel_symbol *ks,
>+		   struct tracepoint * const *tp);
>+#endif /* CONFIG_MODVERSIONS */
>+

Hi Mathieu,

We're going to need a forward declaration in module.h for struct tracepoint
to address the kbuild warnings.

Thanks,

Jessica

> /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
>
> #define __MODULE_STRING(x) __stringify(x)
>-- 
>2.11.0
>