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    Subject[PATCH V2 16/17] riscv: compat: Add UXL_32 support in start_thread
    Date
    From: Guo Ren <guoren@linux.alibaba.com>

    If the current task is in COMPAT mode, set SR_UXL_32 in status for
    returning userspace.

    Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
    Signed-off-by: Guo Ren <guoren@kernel.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    ---
    arch/riscv/kernel/process.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
    index 03ac3aa611f5..1a666ad299b4 100644
    --- a/arch/riscv/kernel/process.c
    +++ b/arch/riscv/kernel/process.c
    @@ -97,6 +97,11 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
    }
    regs->epc = pc;
    regs->sp = sp;
    +
    +#ifdef CONFIG_COMPAT
    + if (is_compat_task())
    + regs->status |= SR_UXL_32;
    +#endif
    }

    void flush_thread(void)
    --
    2.25.1
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