From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932859AbbIDOXa (ORCPT ); Fri, 4 Sep 2015 10:23:30 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:35365 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932559AbbIDOX2 (ORCPT ); Fri, 4 Sep 2015 10:23:28 -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 3/3] arm64: Reduce kernel stack size when using IRQ stack Date: Fri, 4 Sep 2015 14:23:07 +0000 Message-Id: <1441376587-12979-4-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 It is a principal objective of IRQ stack feature to reduce kernel stack size. Therefore, the size is set to 8KB when a separate IRQ stack is active. Signed-off-by: Jungseok Lee --- arch/arm64/include/asm/thread_info.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 5345a67..e79210d 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -24,10 +24,18 @@ #include #ifndef CONFIG_ARM64_64K_PAGES +#ifdef CONFIG_IRQ_STACK +#define THREAD_SIZE_ORDER 1 +#else #define THREAD_SIZE_ORDER 2 #endif +#endif +#ifdef CONFIG_IRQ_STACK +#define THREAD_SIZE 8192 +#else #define THREAD_SIZE 16384 +#endif #define THREAD_START_SP (THREAD_SIZE - 16) #ifndef __ASSEMBLY__ -- 1.9.1