linux-kernel - Re: [RFC v2 10/12] powerpc: Read AMR only if pkey-violation caused the exception.

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Date:   Mon, 19 Jun 2017 21:06:13 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
        linuxram@...ibm.com
Subject: Re: [RFC v2 10/12] powerpc: Read AMR only if pkey-violation caused the exception.

Ram Pai <linuxram@...ibm.com> writes:

> Signed-off-by: Ram Pai <linuxram@...ibm.com>
> ---
>  arch/powerpc/kernel/exceptions-64s.S | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
> index 8db9ef8..a4de1b4 100644
> --- a/arch/powerpc/kernel/exceptions-64s.S
> +++ b/arch/powerpc/kernel/exceptions-64s.S
> @@ -493,13 +493,15 @@ EXC_COMMON_BEGIN(data_access_common)
>  	ld	r12,_MSR(r1)
>  	ld	r3,PACA_EXGEN+EX_DAR(r13)
>  	lwz	r4,PACA_EXGEN+EX_DSISR(r13)
> +	std	r3,_DAR(r1)
> +	std	r4,_DSISR(r1)
>  #ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
> +	andis.  r0,r4,DSISR_KEYFAULT@h /* save AMR only if its a key fault */
> +	beq+	1f

This seems to be incremental on top of one of your other patches.

But I don't see why, can you please just squash this into whatever patch
adds this code in the first place.

cheers