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    Subject[PATCH 5.8 201/255] powerpc/32s: Disable VMAP stack which CONFIG_ADB_PMU
    Date
    From: Christophe Leroy <christophe.leroy@csgroup.eu>

    commit 4a133eb351ccc275683ad49305d0b04dde903733 upstream.

    low_sleep_handler() can't restore the context from virtual
    stack because the stack can hardly be accessed with MMU OFF.

    For now, disable VMAP stack when CONFIG_ADB_PMU is selected.

    Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
    Cc: stable@vger.kernel.org # v5.6+
    Reported-by: Giuseppe Sacco <giuseppe@sguazz.it>
    Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/ec96c15bfa1a7415ab604ee1c98cd45779c08be0.1598553015.git.christophe.leroy@csgroup.eu
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/platforms/Kconfig.cputype | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/powerpc/platforms/Kconfig.cputype
    +++ b/arch/powerpc/platforms/Kconfig.cputype
    @@ -36,7 +36,7 @@ config PPC_BOOK3S_6xx
    select PPC_HAVE_PMU_SUPPORT
    select PPC_HAVE_KUEP
    select PPC_HAVE_KUAP
    - select HAVE_ARCH_VMAP_STACK
    + select HAVE_ARCH_VMAP_STACK if !ADB_PMU

    config PPC_BOOK3S_601
    bool "PowerPC 601"

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