linux-kernel - Re: [PATCH] x86: split e820 reserved entries record to late v4

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Date:	Mon, 13 Oct 2008 15:40:28 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"Tony Luck" <tony.luck@...el.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, tglx@...utronix.de,
	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: split e820 reserved entries record to late v4 - fix v7

On Mon, Oct 13, 2008 at 2:46 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>
> On Mon, 13 Oct 2008, H. Peter Anvin wrote:
>>
>> Here is a fix... currently running standard tests on it.
>
> Or we could do what Andrew suggested some time ago, and extend %p to do
> resource printing, like %pS and %pF.
>
> TOTALLY UNTESTED! But something like this might allow
>
>        printk(KERN_DEBUG "  reserve_region: (%s) %pR\n"
>                res->name, res);
>
> and if I did things right it should print
>
>        reserve_region: (name) [xx-xx]
>
> and maybe it's worth it. We certainly do seem to have a fair number of
> those irritating casts for resource printouts.
>
>                Linus
> ---
>  lib/vsprintf.c |   18 ++++++++++++++++++
>  1 files changed, 18 insertions(+), 0 deletions(-)
>
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index c399bc1..dd62557 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -24,6 +24,7 @@
>  #include <linux/kernel.h>
>  #include <linux/kallsyms.h>
>  #include <linux/uaccess.h>
> +#include <linux/ioport.h>
>
>  #include <asm/page.h>          /* for PAGE_SIZE */
>  #include <asm/div64.h>
> @@ -528,6 +529,21 @@ static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int
>  #endif
>  }
>
> +static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags)
> +{
> +       char sym[4*sizeof(resource_size_t) + 4];
> +       char *p = sym, *pend = sym + sizeof(sym);
> +
> +       *p++ = '[';
> +       p = number(p, pend, res->start, 16, -1, -1, 0);
> +       *p++ = '-';
> +       p = number(p, pend, res->end, 16, -1, -1, 0);
> +       *p++ = ']';
> +       *p = 0;
> +
> +       return string(buf, end, sym, field_width, precision, flags);

can we have
       printk(KERN_DEBUG "  reserve_region: (%s) %04pR\n"
               res->name, res);
or
       printk(KERN_DEBUG "  reserve_region: (%s) %08pR\n"
               res->name, res);

because io port resource will only 4 digi only.

YH
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