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    Subject[PATCH 5.15 105/124] ARC: entry: fix syscall_trace_exit argument
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    From: Sergey Matyukevich <sergey.matyukevich@synopsys.com>

    commit b1c6ecfdd06907554518ec384ce8e99889d15193 upstream.

    Function syscall_trace_exit expects pointer to pt_regs. However
    r0 is also used to keep syscall return value. Restore pointer
    to pt_regs before calling syscall_trace_exit.

    Cc: <stable@vger.kernel.org>
    Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
    Signed-off-by: Vineet Gupta <vgupta@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/arc/kernel/entry.S | 1 +
    1 file changed, 1 insertion(+)

    --- a/arch/arc/kernel/entry.S
    +++ b/arch/arc/kernel/entry.S
    @@ -196,6 +196,7 @@ tracesys_exit:
    st r0, [sp, PT_r0] ; sys call return value in pt_regs

    ;POST Sys Call Ptrace Hook
    + mov r0, sp ; pt_regs needed
    bl @syscall_trace_exit
    b ret_from_exception ; NOT ret_from_system_call at is saves r0 which
    ; we'd done before calling post hook above

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