linux-kernel - Re: [PATCH] powerpc/mm/32s: only use MMU to mark initmem NX if STRICT_KERNEL

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Message-ID: <87pnne9aqo.fsf@igel.home>
Date:   Sat, 15 Jun 2019 16:36:15 +0200
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        j.neuschaefer@....net, Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] powerpc/mm/32s: only use MMU to mark initmem NX if STRICT_KERNEL_RWX

On Jun 15 2019, Christophe Leroy <christophe.leroy@....fr> wrote:

> Andreas Schwab <schwab@...ux-m68k.org> a écrit :
>
>> If STRICT_KERNEL_RWX is disabled, never use the MMU to mark initmen
>> nonexecutable.
>
> I dont understand, can you elaborate ?

It breaks suspend.

> This area is mapped with BATs so using change_page_attr() is pointless.

There must be a reason STRICT_KERNEL_RWX is not available with
HIBERNATE.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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