linux-kernel - Re: [RFC PATCH 8/8] Revert "percpu: free percpu allocation info for uniprocessor system"

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Message-ID: <541F1AFF.9040509@roeck-us.net>
Date:	Sun, 21 Sep 2014 11:37:51 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mikael Starvik <mikael.starvik@...s.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Waldemar Brodkorb <mail@...demar-brodkorb.de>,
	Jesper Nilsson <jespern@...s.com>,
	Mikael Starvik <starvik@...s.com>,
	linux-cris-kernel <linux-cris-kernel@...s.com>
Subject: Re: [RFC PATCH 8/8] Revert "percpu: free percpu allocation info for
 uniprocessor system"

On 09/21/2014 10:23 AM, Mikael Starvik wrote:
> Thanks for all your work with CRIS! CRISv10 is alive but is currently used as small helper CPUs close to hardware blocks.
>

You are welcome. Now it would be even better if we could get the upstream code to work
with qemu. Which leads to the questions - is CRISv32 alive, and is there a chance
to get there ? Also, if CRISv10 is alive, is there any interest or even benefit to
maintain it in the latest kernel ? Because if not, we might as well drop v10 support
to simplify kernel maintenance.

Thanks,
Guenter

> Jesper will review and ack.
>
>> 21 sep 2014 kl. 18:27 skrev "Guenter Roeck" <linux@...ck-us.net>:
>>
>> This reverts commit 3189eddbcafcc4d827f7f19facbeddec4424eba8.
>>
>> The commit causes a hang with a crisv32 image. This may be an architecture
>> problem, but at least for now the revert is necessary to be able to boot a
>> crisv32 image.
>>
>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>> ---
>> mm/percpu.c | 2 --
>> 1 file changed, 2 deletions(-)
>>
>> diff --git a/mm/percpu.c b/mm/percpu.c
>> index da997f9..2139e30 100644
>> --- a/mm/percpu.c
>> +++ b/mm/percpu.c
>> @@ -1932,8 +1932,6 @@ void __init setup_per_cpu_areas(void)
>>
>>     if (pcpu_setup_first_chunk(ai, fc) < 0)
>>         panic("Failed to initialize percpu areas.");
>> -
>> -    pcpu_free_alloc_info(ai);
>> }
>>
>> #endif    /* CONFIG_SMP */
>> --
>> 1.9.1
>>
>

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