linux-kernel - Re: [PATCH] cacheinfo: Keep the old value if of_property_read

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Message-ID: <20181018091146.GA22021@e107155-lin>
Date:   Thu, 18 Oct 2018 10:15:43 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Huacai Chen <chenhc@...ote.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        zhangfx <zhangfx@...ote.com>, wu zhangjin <wuzhangjin@...il.com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH] cacheinfo: Keep the old value if of_property_read_u32
 fails

Hi Huacai,

On Thu, Oct 18, 2018 at 09:28:11AM +0800, Huacai Chen wrote:
> Hi, Sudeep,
> 
> Please see this call-graph:
> 
> static int detect_cache_attributes(unsigned int cpu)
>         ....
>         ret = populate_cache_leaves(cpu);
>         ....
>         ret = cache_shared_cpu_map_setup(cpu); -->
> cache_setup_of_node() --> cache_of_set_props() -->
> cache_size()/cache_nr_sets
> 
> populate_cache_leaves() is arch-specific, All archs except arm64 have
> provide initial values to cacheinfo:size and cacheinfo:number_of_sets.
> 
> Related files:
> arch/nds32/kernel/cacheinfo.c
> arch/mips/kernel/cacheinfo.c

Only above 2 could be affected, but I want to be sure. I wasn't aware
of MIPS arch setting values elsewhere, assumed DT, my bad.
You have still not answered my question. Which arch are you facing issue ?
Or are you proposing this by code inspection ? I changes look fine, but
want to be sure if the issue you are seeing is in above architectures.

--
Regards,
Sudeep