linux-kernel - Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL

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Date:   Sat, 15 Jun 2019 14:28:35 +0200
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, j.neuschaefer@....net,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX

On Feb 21 2019, Christophe Leroy <christophe.leroy@....fr> wrote:

> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
> index a000768a5cc9..6e56a6240bfa 100644
> --- a/arch/powerpc/mm/pgtable_32.c
> +++ b/arch/powerpc/mm/pgtable_32.c
> @@ -353,7 +353,10 @@ void mark_initmem_nx(void)
>  	unsigned long numpages = PFN_UP((unsigned long)_einittext) -
>  				 PFN_DOWN((unsigned long)_sinittext);
>  
> -	change_page_attr(page, numpages, PAGE_KERNEL);
> +	if (v_block_mapped((unsigned long)_stext) + 1)

That is always true.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."