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Subject: Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX
To:     Andreas Schwab <schwab@linux-m68k.org>
Cc:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>, j.neuschaefer@gmx.net,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
References: <cover.1550775950.git.christophe.leroy@c-s.fr>
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From:   christophe leroy <christophe.leroy@c-s.fr>
Message-ID: <a76f7759-a407-3d9a-0f43-654fd7ea0b1e@c-s.fr>
Date:   Sun, 16 Jun 2019 10:20:29 +0200
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Le 15/06/2019 à 13:23, Andreas Schwab a écrit :
> This breaks suspend (or resume) on the iBook G4.  no_console_suspend
> doesn't give any clues, the display just stays dark.
> 

After a quick look at the suspend functions, I have the feeling that 
those functions only store and restore BATs 0 to 3.

Could you build your kernel with CONFIG_PPC_PTDUMP and see in file 
/sys/kernel/debug/powerpc/segment_registers how many IBATs registers are 
used.
If any of registers IBATs 4 to 7 are used, could you adjust 
CONFIG_ETEXT_SHIFT so that only IBATs 0 to 3 be used, and check if 
suspend/resume works when IBATs 4 to 7 are not used ?

Thanks
Christophe

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