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    Subject[RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h
    Date
    Under EL1h, S_SP data is not seen in kernel_exit. Thus, x21 calculation
    is not needed in kernel_entry. Currently, S_SP information is vaild only
    when sp_el0 is used.

    Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com>
    ---
    arch/arm64/kernel/entry.S | 2 --
    1 file changed, 2 deletions(-)

    diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
    index e163518..d23ca0d 100644
    --- a/arch/arm64/kernel/entry.S
    +++ b/arch/arm64/kernel/entry.S
    @@ -91,8 +91,6 @@
    get_thread_info tsk // Ensure MDSCR_EL1.SS is clear,
    ldr x19, [tsk, #TI_FLAGS] // since we can unmask debug
    disable_step_tsk x19, x20 // exceptions when scheduling.
    - .else
    - add x21, sp, #S_FRAME_SIZE
    .endif
    mrs x22, elr_el1
    mrs x23, spsr_el1
    --
    1.9.1


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