linux-kernel - Re: Re: [PATCH v2] arm64: add alignment fault hanling

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Message-id: <225030523.1150721455875195200.JavaMail.weblogic@epmlwas08c>
Date:	Fri, 19 Feb 2016 09:46:37 +0000 (GMT)
From:	EunTaik Lee <eun.taik.lee@...sung.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	"vladimir.murzin@....com" <vladimir.murzin@....com>,
	"suzuki.poulose@....com" <suzuki.poulose@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"salyzyn@...roid.com" <salyzyn@...roid.com>,
	"riandrews@...roid.com" <riandrews@...roid.com>,
	"james.morse@....com" <james.morse@....com>,
	"Dave.Martin@....com" <Dave.Martin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Re: [PATCH v2] arm64: add alignment fault hanling

2016-02-17 2:11 GMT+09:00 Catalin Marinas <catalin.marinas@....com>:
> On Tue, Feb 16, 2016 at 04:44:38AM +0000, EunTaik Lee wrote:
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index 19211c4..a5ebb99 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -371,6 +371,14 @@ static int __kprobes do_translation_fault(unsigned long addr,
>>       return 0;
>>  }
>>
>> +static int __kprobes do_alignment_fault(unsigned long addr,
>> +                                       unsigned int esr,
>> +                                       struct pt_regs *regs)
>> +{
>> +     do_bad_area(addr, esr, regs);
>> +     return 0;
>> +}
>> +
>>  /*
>>   * This abort handler always returns "fault".
>>   */
>> @@ -418,7 +426,7 @@ static struct fault_info {
>>       { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
>>       { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
>>       { do_bad,               SIGBUS,  0,             "unknown 32"                    },
>> -     { do_bad,               SIGBUS,  BUS_ADRALN,    "alignment fault"               },
>> +     { do_alignment_fault,   SIGBUS,  BUS_ADRALN,    "alignment fault"               },
>
> Do you need a new function, can you not just add do_bad_area in the
> fault_info array?

I made a new function since do_bad_area currently does not return any value.
Should I just make it return an integer instead of making a new function for the
unaligned fault?

Euntaik