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

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Date:   Thu, 8 Aug 2019 11:19:07 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Miles Chen <miles.chen@...iatek.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     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 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.

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