From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20090225150836.091189939@de.ibm.com> References: <20090225150622.529143164@de.ibm.com> Date: Wed, 25 Feb 2009 16:06:54 +0100 From: Martin Schwidefsky Subject: [patch/s390 32/46] kernel: Disable switch_amode by default Content-Disposition: inline; filename=131-amode-default.diff Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Heiko Carstens , Gerald Schaefer , Martin Schwidefsky List-ID: From: Gerald Schaefer Disable switch_amode by default because pagetable walk on pre z9 hardware has negative performance impact. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/setup.c | 4 ---- 1 file changed, 4 deletions(-) Index: quilt-2.6/arch/s390/kernel/setup.c =================================================================== --- quilt-2.6.orig/arch/s390/kernel/setup.c +++ quilt-2.6/arch/s390/kernel/setup.c @@ -301,11 +301,7 @@ static int __init early_parse_mem(char * early_param("mem", early_parse_mem); #ifdef CONFIG_S390_SWITCH_AMODE -#ifdef CONFIG_PGSTE -unsigned int switch_amode = 1; -#else unsigned int switch_amode = 0; -#endif EXPORT_SYMBOL_GPL(switch_amode); static int set_amode_and_uaccess(unsigned long user_amode, -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.