Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX

christophe leroy
2019-06-16T08:21:21Z

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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