linux-kernel - Re: [RFC PATCH v2 3/4] powerpc: refactor of_get_cpu

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Date:	Sat, 17 Aug 2013 08:13:06 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Jonas Bonn <jonas@...thpole.se>,
	Michal Simek <monstr@...str.eu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [RFC PATCH v2 3/4] powerpc: refactor of_get_cpu_node to support
 other architectures

On Fri, 2013-08-16 at 18:39 +0100, Sudeep KarkadaNagesha wrote:
> +static bool __of_find_n_match_cpu_property(struct device_node *cpun,
> +                       const char *prop_name, int cpu, unsigned int
> *thread)
> +{
> +       const __be32 *cell;
> +       int ac, prop_len, tid;
> +       u64 hwid;
> +
> +       ac = of_n_addr_cells(cpun);
> +       cell = of_get_property(cpun, prop_name, &prop_len);
> +       if (!cell)
> +               return false;
> +       prop_len /= sizeof(*cell);
> +       for (tid = 0; tid < prop_len; tid++) {
> +               hwid = of_read_number(cell, ac);
> +               if (arch_match_cpu_phys_id(cpu, hwid)) {
> +                       if (thread)
> +                               *thread = tid;
> +                       return true;
> +               }
> +               cell += ac;
> +       }
> +       return false;
> +}

The only problem I can see here is if "ac" is not 1, that will not work
for the ibm,ppc-interrupt-server#s case. IE. The latter is always 1 cell
per entry, only "reg" depends on #address-cells.

However that's only a theorical problem since on ppc #address-cells of
/cpus is always 1...

Cheers,
Ben.


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