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

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Date:   Thu, 8 Aug 2019 14:58:31 +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 11:51 +0530, Anshuman Khandual wrote:
> 
> On 08/08/2019 11:31 AM, Miles Chen wrote:
> > 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.
> 
> Yeah because V2 has now implemented the suggestion as required for
> getting the tag per Mark in V1.
> 

Understood. thanks for the explanation


> > 
> >> 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?
> 
> Right.