linux-kernel - Re: [PATCH] module: LLVMLinux: Fix section mismatch issues on alias usage

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Date:	Fri, 21 Feb 2014 10:08:14 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<behanw@...verseincode.com>, <rob@...dley.net>,
	<rdunlap@...radead.org>, <geert@...ux-m68k.org>
CC:	<akpm@...ux-foundation.org>, <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>,
	Jan-Simon Möller <dl9pf@....de>
Subject: Re: [PATCH] module: LLVMLinux: Fix section mismatch issues on alias
 usage

On 14-02-20 11:28 PM, behanw@...verseincode.com wrote:
> From: Jan-Simon Möller <dl9pf@....de>
  ^^^^^^^^^^^^^^

This line implies that Jan is the author.

> 
> Attribute aliases don't inherit the link section name when compiled with clang.
> As a result, the linking section needs to be explicitly specified when building
> a module. This behavior is undefined in the standard which is why it differs from
> compiler to compiler.

But is there a good reason why clang doesn't inherit them in the
interest of compatibility with gcc and existing code?

> 
> Author:  PaX Team <pageexec@...email.hu>
> ML-Post: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120507/142707.html
> URL:     http://llvm.linuxfoundation.org
> Merge:   Jan-Simon Möller <dl9pf@....de>

I know we've seen the faceless entity "PaX Team" before, but can we
please not make it worse by adding a bunch of other non standard tag
line formats?  And ideally have a real human name for the author too.

Paul.
--

> Signed-off-by: Jan-Simon Möller <dl9pf@....de>
> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> ---
>  include/linux/init.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/init.h b/include/linux/init.h
> index e168880..384ec5e 100644
> --- a/include/linux/init.h
> +++ b/include/linux/init.h
> @@ -297,13 +297,14 @@ void __init parse_early_options(char *cmdline);
>  #define module_init(initfn)					\
>  	static inline initcall_t __inittest(void)		\
>  	{ return initfn; }					\
> -	int init_module(void) __attribute__((alias(#initfn)));
> +	int init_module(void) __section(.init) __attribute__((alias(#initfn)));
>  
>  /* This is only required if you want to be unloadable. */
>  #define module_exit(exitfn)					\
>  	static inline exitcall_t __exittest(void)		\
>  	{ return exitfn; }					\
> -	void cleanup_module(void) __attribute__((alias(#exitfn)));
> +	void cleanup_module(void) __section(.exit)              \
> +		__attribute__((alias(#exitfn)));
>  
>  #define __setup_param(str, unique_id, fn)	/* nothing */
>  #define __setup(str, func) 			/* nothing */
> 
--
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