linux-kernel - Re: [PATCH 1/2] ARM: Pass IFSR register to do

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Message-ID: <4AB39EC3.4050202@nokia.com>
Date:	Fri, 18 Sep 2009 17:52:51 +0300
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	"ext Kirill A. Shutemov" <kirill@...temov.name>
CC:	Aaro Koskinen <aakoskin@...ia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Bityutskiy Artem (Nokia-D/Helsinki)" <Artem.Bityutskiy@...ia.com>
Subject: Re: [PATCH 1/2] ARM: Pass IFSR register to do_PrefetchAbort()

Hello,

Kirill A. Shutemov wrote:
>>  #ifdef CONFIG_CPU_PABRT_NOIFAR
>> -# ifdef CPU_PABORT_HANDLER
>> +# ifdef CPU_PABORT_HANDLER_IFAR
>>  #  define MULTI_PABORT 1
>>  # else
>> -#  define CPU_PABORT_HANDLER(reg, insn)        mov reg, insn
>> +#  define CPU_PABORT_HANDLER_IFAR(reg, insn)   mov reg, insn
>> +#  define CPU_PABORT_HANDLER_IFSR(reg)         mrc p15, 0, reg, cr5, cr0, 1
> 
> It's incorrect. We have IFSR only on ARMv7.

It seems my assumption on the availability of that register was wrong, 
but I think it's available at least on ARMv6, and also that IFAR can be 
optional...

A.
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