linux-kernel - Re: [PATCH 1/5] powerpc/ptdump: fix addresses display on PPC32

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Date:   Wed, 14 Aug 2019 14:51:27 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] powerpc/ptdump: fix addresses display on PPC32

Michael,

Le 14/08/2019 à 14:36, Christophe Leroy a écrit :
> Commit 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot")
> wrongly changed KERN_VIRT_START from 0 to PAGE_OFFSET, leading to a
> shift in the displayed addresses.
> 
> Lets revert that change to resync walk_pagetables()'s addr val and
> pgd_t pointer for PPC32.
> 
> Fixes: 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot")

Either this patch or patch 2 of the series has to go into fixes.

If you prefer next patch for fixes, then this one can be squashed into 
patch 3 which drops the PPC32 hacked definition of KERN_VIRT_START

Christophe

> Cc: stable@...r.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>   arch/powerpc/mm/ptdump/ptdump.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
> index 6a88a9f585d4..3ad64fc11419 100644
> --- a/arch/powerpc/mm/ptdump/ptdump.c
> +++ b/arch/powerpc/mm/ptdump/ptdump.c
> @@ -27,7 +27,7 @@
>   #include "ptdump.h"
>   
>   #ifdef CONFIG_PPC32
> -#define KERN_VIRT_START	PAGE_OFFSET
> +#define KERN_VIRT_START	0
>   #endif
>   
>   /*
>