linux-kernel - Re: [PATCH v2] arm64: mm: print hexadecimal EC value in mem_abort

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Date:   Thu, 8 Aug 2019 14:01:15 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     Anshuman Khandual <anshuman.khandual@....com>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Mark Rutland <Mark.rutland@....com>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH v2] arm64: mm: print hexadecimal EC value in
 mem_abort_decode()

On Thu, 2019-08-08 at 11:19 +0530, Anshuman Khandual wrote:
> 
> On 08/07/2019 06:03 AM, Miles Chen wrote:
> > This change prints the hexadecimal EC value in mem_abort_decode(),
> > which makes it easier to lookup the corresponding EC in
> > the ARM Architecture Reference Manual.
> > 
> > The commit 1f9b8936f36f ("arm64: Decode information from ESR upon mem
> > faults") prints useful information when memory abort occurs. It would
> > be easier to lookup "0x25" instead of "DABT" in the document. Then we
> > can check the corresponding ISS.
> > 
> > For example:
> > Current	info	  	Document
> > 		  	EC	Exception class
> > "CP15 MCR/MRC"		0x3	"MCR or MRC access to CP15a..."
> > "ASIMD"			0x7	"Access to SIMD or floating-point..."
> > "DABT (current EL)" 	0x25	"Data Abort taken without..."
> > ...
> > 
> > Before:
> > Unable to handle kernel paging request at virtual address 000000000000c000
> > Mem abort info:
> >   ESR = 0x96000046
> >   Exception class = DABT (current EL), IL = 32 bits
> >   SET = 0, FnV = 0
> >   EA = 0, S1PTW = 0
> > Data abort info:
> >   ISV = 0, ISS = 0x00000046
> >   CM = 0, WnR = 1
> > 
> > After:
> > Unable to handle kernel paging request at virtual address 000000000000c000
> > Mem abort info:
> >   ESR = 0x96000046
> >   EC = 0x25: DABT (current EL), IL = 32 bits
> >   SET = 0, FnV = 0
> >   EA = 0, S1PTW = 0
> > Data abort info:
> >   ISV = 0, ISS = 0x00000046
> >   CM = 0, WnR = 1
> > 
> > Change since v1:
> > print "EC" instead of "Exception class"
> > print EC in fixwidth
> > 
> > Cc: Mark Rutland <Mark.rutland@....com>
> > Cc: Anshuman Khandual <anshuman.khandual@....com>
> > Cc: James Morse <james.morse@....com>
> > Signed-off-by: Miles Chen <miles.chen@...iatek.com>
> 
> This version implements the suggestion, hence it should have
> also contained acked-by tag from Mark from earlier version.
> 

No problem. Sorry for not including the tag.
I was not sure if I should add the acked-by tag from Mark in patch v2.

> Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>

If I send patch v3, I should include acked-by tag from Mark and
Reviewed-by tag from you, right?


Miles