linux-kernel - Re: [PATCH] ARM: LLVMLinux: Change "extern inline" to "gnu

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Date:	Wed, 14 Aug 2013 14:56:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	behanw@...verseincode.com
Cc:	linux@....linux.org.uk, rostedt@...dmis.org, fweisbec@...il.com,
	mingo@...hat.com, charlebm@...il.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: LLVMLinux: Change "extern inline" to "gnu_inline"
 in ARM ftrace.h

On Wed, 2013-08-14 at 17:37 -0400, behanw@...verseincode.com wrote:
> From: Mark Charlebois <charlebm@...il.com>
> 
> With compilers which follow the C99 standard (like modern versions of gcc and
> clang), "extern inline" does the wrong thing (emits code for an externally
> linkable version of the inline function). In this case using the gnu_inline
> attribute makes inline do the right thing on gcc and on clang.

Why not convert these to static inline?

> diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
[]
> @@ -45,7 +45,8 @@ void *return_address(unsigned int);
>  
>  #else
>  
> -extern inline void *return_address(unsigned int level)
> +extern inline __attribute__((gnu_inline))
> +void *return_address(unsigned int level)
>  {
>  	return NULL;
>  }



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