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    Subject[PATCH 5.4 138/261] MIPS: Fix IRQ tracing when call handle_fpe() and handle_msa_fpe()
    Date
    From: YuanJunQing <yuanjunqing66@163.com>

    [ Upstream commit 31e1b3efa802f97a17628dde280006c4cee4ce5e ]

    Register "a1" is unsaved in this function,
    when CONFIG_TRACE_IRQFLAGS is enabled,
    the TRACE_IRQS_OFF macro will call trace_hardirqs_off(),
    and this may change register "a1".
    The changed register "a1" as argument will be send
    to do_fpe() and do_msa_fpe().

    Signed-off-by: YuanJunQing <yuanjunqing66@163.com>
    Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/mips/kernel/genex.S | 6 +++---
    1 file changed, 3 insertions(+), 3 deletions(-)

    diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
    index efde27c99414..9c5f8a5d097f 100644
    --- a/arch/mips/kernel/genex.S
    +++ b/arch/mips/kernel/genex.S
    @@ -474,20 +474,20 @@ NESTED(nmi_handler, PT_SIZE, sp)
    .endm

    .macro __build_clear_fpe
    + CLI
    + TRACE_IRQS_OFF
    .set push
    /* gas fails to assemble cfc1 for some archs (octeon).*/ \
    .set mips1
    SET_HARDFLOAT
    cfc1 a1, fcr31
    .set pop
    - CLI
    - TRACE_IRQS_OFF
    .endm

    .macro __build_clear_msa_fpe
    - _cfcmsa a1, MSA_CSR
    CLI
    TRACE_IRQS_OFF
    + _cfcmsa a1, MSA_CSR
    .endm

    .macro __build_clear_ade
    --
    2.25.1


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