linux-kernel - Re: [2.6 patch] blackfin: "extern inline" -> "static inline"

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Message-ID: <20071025150545.GK30533@stusta.de>
Date:	Thu, 25 Oct 2007 17:05:45 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Mike Frysinger <vapier.adi@...il.com>,
	Jie Zhang <jzhang.linux@...il.com>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] blackfin: "extern inline" -> "static inline"

On Wed, Oct 24, 2007 at 08:06:14PM -0700, H. Peter Anvin wrote:
> Mike Frysinger wrote:
>> On 10/24/07, Jie Zhang <jzhang.linux@...il.com> wrote:
>>> On 10/25/07, Adrian Bunk <bunk@...nel.org> wrote:
>>>> "extern inline" will have different semantics with gcc 4.3.
>>>>
>>>> Signed-off-by: Adrian Bunk <bunk@...nel.org>
>>>>
>>>> --- a/include/asm-blackfin/string.h
>>>> +++ b/include/asm-blackfin/string.h
>>>> @@ -4,7 +4,7 @@
>>>>  #ifdef __KERNEL__              /* only set these up for kernel code */
>>>>
>>>>  #define __HAVE_ARCH_STRCPY
>>>> -extern inline char *strcpy(char *dest, const char *src)
>>>> +static inline char *strcpy(char *dest, const char *src)
>>>>  {
>>>>         char *xdest = dest;
>>>>         char temp = 0;
>>> What if we compile it with gcc 4.1?
>> we'll have to either use the gcc attributes to force old inline
>> behavior or use the gcc flag to force it
>
> We should probably have an extern_inline define then, assuming this is a 
> function that does exist in a linkable version already -- otherwise "static 
> inline" is correct.

Since we #define inline to be __attribute__((always_inline))
"extern inline" with the old semantics would only behave differently
if someone took the address of one of these string functions.

Does this happen anywhere in the blackfin port?

> 	-hpa

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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