From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756744Ab0JPVoo (ORCPT ); Sat, 16 Oct 2010 17:44:44 -0400 Received: from [69.28.251.93] ([69.28.251.93]:33779 "EHLO b32.net" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755267Ab0JPVoW (ORCPT ); Sat, 16 Oct 2010 17:44:22 -0400 From: Kevin Cernekee To: Ralf Baechle Cc: , Subject: [PATCH resend 8/9] MIPS: Honor L2 bypass bit Date: Sat, 16 Oct 2010 14:22:37 -0700 Message-Id: In-Reply-To: <17ebecce124618ddf83ec6fe8e526f93@localhost> References: <17ebecce124618ddf83ec6fe8e526f93@localhost> User-Agent: vim 7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If CP0 CONFIG2 bit 12 (L2B) is set, the L2 cache is disabled and therefore Linux should not attempt to use it. Signed-off-by: Kevin Cernekee --- arch/mips/mm/sc-mips.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/mips/mm/sc-mips.c b/arch/mips/mm/sc-mips.c index 5ab5fa8..d072b25 100644 --- a/arch/mips/mm/sc-mips.c +++ b/arch/mips/mm/sc-mips.c @@ -79,6 +79,11 @@ static inline int __init mips_sc_probe(void) return 0; config2 = read_c0_config2(); + + /* bypass bit */ + if (config2 & (1 << 12)) + return 0; + tmp = (config2 >> 4) & 0x0f; if (0 < tmp && tmp <= 7) c->scache.linesz = 2 << tmp; -- 1.7.0.4