linux-kernel - Re: [RFC][PATCH] Kexec support for PPC440x

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Message-ID: <4DE72EFE.8080502@in.ibm.com>
Date:	Thu, 02 Jun 2011 12:04:38 +0530
From:	Suzuki Poulose <suzuki@...ibm.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	linux ppc dev <linuxppc-dev@...ts.ozlabs.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] Kexec support for PPC440x

On 05/31/11 20:45, Sebastian Andrzej Siewior wrote:
>
> Suzuki Poulose wrote:
>> Index: powerpc/arch/powerpc/kernel/44x_kexec_mapping.S
>> ===================================================================
>> --- /dev/null
>> +++ powerpc/arch/powerpc/kernel/44x_kexec_mapping.S
> ....
>
>> + *
>> + */
>> + bl nxtins /* Find our address */
>> +nxtins: mflr r5 /* Make it accessible */
>
> Please don't mix labels and instructions.
OK.
>
>> + tlbsx r23,0,r5 /* Find entry we are in */
>
> using tabs instead of spaces would make it look nice. Please also separate the arguments of the instruction i.e.
> tlbsx r23, 0, r5

Sure.
>
>
>> Index: powerpc/arch/powerpc/kernel/misc_32.S
>> ===================================================================
>> --- powerpc.orig/arch/powerpc/kernel/misc_32.S
>> +++ powerpc/arch/powerpc/kernel/misc_32.S
>> @@ -736,6 +736,28 @@ relocate_new_kernel:
>> mr r5, r31
>>
>> li r0, 0
>> +#elif defined(CONFIG_44x) && !defined(CONFIG_47x)
>> +
>> + mr r29, r3
>> + mr r30, r4
>> + mr r31, r5
>> +
>> +#include "44x_kexec_mapping.S"
>
> The way you setup the 1:1 mapping should be close to what you are doing on
> kernel entry.Isn't it possible to include the file here and in the entry
> code?
I will make this change and resend the patch.

Thanks

Suzuki
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