From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.windriver.com (mail.windriver.com [147.11.1.11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mail.windriver.com", Issuer "Intel External Basic Issuing CA 3A" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D8F832C0343 for ; Tue, 9 Jul 2013 18:03:03 +1000 (EST) From: Tiejun Chen To: Subject: [v3][PATCH 8/8] book3e/kexec/kdump: recover "r4 = 0" to create the initial TLB Date: Tue, 9 Jul 2013 16:03:27 +0800 Message-ID: <1373357007-30785-9-git-send-email-tiejun.chen@windriver.com> In-Reply-To: <1373357007-30785-1-git-send-email-tiejun.chen@windriver.com> References: <1373357007-30785-1-git-send-email-tiejun.chen@windriver.com> MIME-Version: 1.0 Content-Type: text/plain Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , In commit 96f013f, "powerpc/kexec: Add kexec "hold" support for Book3e processors", requires that GPR4 survive the "hold" process, for IBM Blue Gene/Q with with some very strange firmware. But for FSL Book3E, r4 = 1 to indicate that the initial TLB entry for this core already exists so we still should set r4 with 0 to create that initial TLB. Signed-off-by: Tiejun Chen --- arch/powerpc/kernel/head_64.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 0b46c9d..d546c5e 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -127,6 +127,10 @@ __secondary_hold: /* Grab our physical cpu number */ mr r24,r3 /* stash r4 for book3e */ +#ifdef CONFIG_PPC_FSL_BOOK3E + /* we need to setup initial TLB entry. */ + li r4,0 +#endif mr r25,r4 /* Tell the master cpu we're here */ -- 1.7.9.5