linux-kernel - Re: [PATCH 2/4] x86: modify show_shared_cpu_map in intel

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Date:	Mon, 07 Apr 2008 11:45:53 -0700
From:	Mike Travis <travis@....com>
To:	Bert Wesarg <bert.wesarg@...glemail.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] x86: modify show_shared_cpu_map in intel_cacheinfo
 v2

Bert Wesarg wrote:
> On Sat, Apr 5, 2008 at 3:24 AM, Mike Travis <travis@....com> wrote:
>>  --- linux-2.6.x86.orig/arch/x86/kernel/cpu/intel_cacheinfo.c
>>  +++ linux-2.6.x86/arch/x86/kernel/cpu/intel_cacheinfo.c
>>  @@ -593,14 +593,17 @@ static ssize_t show_size(struct _cpuid4_
>>
>>   static ssize_t show_shared_cpu_map(struct _cpuid4_info *this_leaf, char *buf)
>>   {
>>  +       unsigned long end = ALIGN((unsigned long)buf, PAGE_SIZE);
> May I suggest this:
> 
>            ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;

Hmm, that sounds great.  There were a number of different methods used in
the various places to provide for that extra '\n'! ;-)

> 
>>  +       if (len == 0)
>>  +               len = PAGE_SIZE;
> Than this is not necessary.
> 
>>  +
>>  +       if (len >= 2) {
>>  +               n = cpus_scnprintf(buf, len-2, this_leaf->shared_cpu_map);
>>  +               buf[n++] = '\n';
>>  +               buf[n] = '\0';
>>         }
>>         return n;
>>   }
> Apart from my suggestion and the use of cpus_scnprintf I think this patch is ok.
> 
> Bert
> 
> PS: sorry for the long delay.

Thanks!
Mike

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