linux-kernel - Re: [PATCH] h8300/kernel/setup.c: add "linux/initrd.h" to pass compiling

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Message-ID: <521B39CA.8060303@asianux.com>
Date:	Mon, 26 Aug 2013 19:19:38 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] h8300/kernel/setup.c: add "linux/initrd.h" to pass compiling

On 08/26/2013 07:08 PM, Geert Uytterhoeven wrote:
> On Mon, Aug 26, 2013 at 1:06 PM, Chen Gang <gang.chen@...anux.com> wrote:
>> On 08/26/2013 07:00 PM, Geert Uytterhoeven wrote:
>>> On Mon, Aug 26, 2013 at 12:31 PM, Chen Gang <gang.chen@...anux.com> wrote:
>>>> --- a/arch/h8300/kernel/setup.c
>>>> +++ b/arch/h8300/kernel/setup.c
>>>> @@ -47,6 +47,9 @@
>>>>  #include <asm/regs267x.h>
>>>>  #endif
>>>>
>>>> +#if defined(CONFIG_BLK_DEV_INITRD)
>>>
>>> Why have you added the #ifdef?
>>>
>>
>> The related code is below (maybe we need add additional related
>> comments in the patch for it ?).
>>
>> in arch/h8300/kernel/setup.c
>>
>>  94 void __init setup_arch(char **cmdline_p)
>>  95 {
>>  96         int bootmap_size;
>>  97
>>  98         memory_start = (unsigned long) &_ramstart;
>>  99
>> 100         /* allow for ROMFS on the end of the kernel */
>> 101         if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
>> 102 #if defined(CONFIG_BLK_DEV_INITRD)
>> 103                 initrd_start = memory_start;
>> 104                 initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
>> 105 #else
>> 106                 memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
>> 107 #endif
>> 108         }
> 
> Sure, it's used conditionally. But it doesn't harm to always include it.
> That means less #ifdefs in the code.
> 

Hmm... I feel, add "#ifdefs" can make the code more clearer (consistent
with the "#ifdefs" 'for initrd_start' and 'end').

For C code readers, more code doesn't mean more complex, if it can make
things clearer after add some more lines (and be sure of no negative
effect with performance), normally I prefer to add some more lines.

And this file has already had an area for all "#ifdefs include", I just
add it in this area, so at least, it can mach this file well, is it ?

;-)


Thanks.

> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 
> 


-- 
Chen Gang
--
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