From mboxrd@z Thu Jan 1 00:00:00 1970 From: jungseoklee85@gmail.com (Jungseok Lee) Date: Fri, 4 Sep 2015 14:23:05 +0000 Subject: [RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h In-Reply-To: <1441376587-12979-1-git-send-email-jungseoklee85@gmail.com> References: <1441376587-12979-1-git-send-email-jungseoklee85@gmail.com> Message-ID: <1441376587-12979-2-git-send-email-jungseoklee85@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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