linux-kernel - Re: [PATCH 01/15] Make %pR could handle bus resource with domain

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Message-ID: <CAErSpo6sdsV_ZEkfLq-tGxY4GvyWSz99h31XqS62RjFvthvJhw@mail.gmail.com>
Date:	Fri, 3 Feb 2012 08:26:37 -0800
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 01/15] Make %pR could handle bus resource with domain

On Wed, Feb 1, 2012 at 2:43 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> So could use %pR for busn_res with domain nr in start/end
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  lib/vsprintf.c |   28 ++++++++++++++++++++++++----
>  1 files changed, 24 insertions(+), 4 deletions(-)
>
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 8e75003..b34eeea 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -451,6 +451,12 @@ char *resource_string(char *buf, char *end, struct resource *res,
>                .precision = -1,
>                .flags = SPECIAL | SMALL | ZEROPAD,
>        };
> +       static const struct printf_spec domain_spec = {
> +               .base = 16,
> +               .field_width = 4,
> +               .precision = -1,
> +               .flags = SMALL | ZEROPAD,
> +       };
>        static const struct printf_spec bus_spec = {
>                .base = 16,
>                .field_width = 2,
> @@ -507,11 +513,25 @@ char *resource_string(char *buf, char *end, struct resource *res,
>                specp = &mem_spec;
>                decode = 0;
>        }
> -       p = number(p, pend, res->start, *specp);
> -       if (res->start != res->end) {
> -               *p++ = '-';
> -               p = number(p, pend, res->end, *specp);
> +
> +       if (res->flags & IORESOURCE_BUS && res->end >> 8) {
> +               p = number(p, pend, res->start >> 8, domain_spec);
> +               *p++ = ':';
> +               p = number(p, pend, res->start & 0xff, *specp);
> +               if (res->start != res->end) {
> +                       *p++ = '-';
> +                       p = number(p, pend, res->end >> 8, domain_spec);
> +                       *p++ = ':';
> +                       p = number(p, pend, res->end & 0xff, *specp);

The "<< 8", ">>8", and "& 0xff" patterns are used frequently in these
patches.  I think it's worth adding macros or inline functions to make
it clear that all these places are connected.

> +               }
> +       } else {
> +               p = number(p, pend, res->start, *specp);
> +               if (res->start != res->end) {
> +                       *p++ = '-';
> +                       p = number(p, pend, res->end, *specp);
> +               }
>        }
> +
>        if (decode) {
>                if (res->flags & IORESOURCE_MEM_64)
>                        p = string(p, pend, " 64bit", str_spec);
> --
> 1.7.7
>
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