From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932949AbbIDOY3 (ORCPT ); Fri, 4 Sep 2015 10:24:29 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:33945 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932767AbbIDOXZ (ORCPT ); Fri, 4 Sep 2015 10:23:25 -0400 From: Jungseok Lee To: catalin.marinas@arm.com, will.deacon@arm.com, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/3] arm64: entry: Remove unnecessary calculation for S_SP in EL1h Date: Fri, 4 Sep 2015 14:23:05 +0000 Message-Id: <1441376587-12979-2-git-send-email-jungseoklee85@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1441376587-12979-1-git-send-email-jungseoklee85@gmail.com> References: <1441376587-12979-1-git-send-email-jungseoklee85@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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