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    Subject[PATCH AUTOSEL 5.15 044/109] arm64/sme: Add ID_AA64SMFR0_EL1 to __read_sysreg_by_encoding()
    Date
    From: Mark Brown <broonie@kernel.org>

    [ Upstream commit 8a58bcd00e2e8d46afce468adc09fcd7968f514c ]

    We need to explicitly enumerate all the ID registers which we rely on
    for CPU capabilities in __read_sysreg_by_encoding(), ID_AA64SMFR0_EL1 was
    missed from this list so we trip a BUG() in paths which rely on that
    function such as CPU hotplug. Add the register.

    Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Signed-off-by: Mark Brown <broonie@kernel.org>
    Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Link: https://lore.kernel.org/r/20220427130828.162615-1-broonie@kernel.org
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/kernel/cpufeature.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
    index e71c9cfb46e8..ca417167675a 100644
    --- a/arch/arm64/kernel/cpufeature.c
    +++ b/arch/arm64/kernel/cpufeature.c
    @@ -1281,6 +1281,7 @@ u64 __read_sysreg_by_encoding(u32 sys_id)
    read_sysreg_case(SYS_ID_AA64PFR0_EL1);
    read_sysreg_case(SYS_ID_AA64PFR1_EL1);
    read_sysreg_case(SYS_ID_AA64ZFR0_EL1);
    + read_sysreg_case(SYS_ID_AA64SMFR0_EL1);
    read_sysreg_case(SYS_ID_AA64DFR0_EL1);
    read_sysreg_case(SYS_ID_AA64DFR1_EL1);
    read_sysreg_case(SYS_ID_AA64MMFR0_EL1);
    --
    2.35.1
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