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Mon, 05 Aug 2019 23:39:28 -0700 Received: from xsj-pvapsmtp01 (smtp2.xilinx.com [149.199.38.66]) by xsj-smtp-dlp2.xlnx.xilinx.com (8.13.8/8.13.1) with ESMTP id x766dMLM001169; Mon, 5 Aug 2019 23:39:22 -0700 Received: from [172.30.17.116] by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1hut7y-0006rA-4v; Mon, 05 Aug 2019 23:39:22 -0700 Subject: Re: [PATCH 1/2] ARM: zynq: support smp in thumb mode To: Luis Araneda , linux@armlinux.org.uk, michal.simek@xilinx.com Cc: stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20190806030718.29048-1-luaraneda@gmail.com> <20190806030718.29048-2-luaraneda@gmail.com> From: Michal Simek Message-ID: <17a45e21-8362-e888-d222-812c879a38a8@xilinx.com> Date: Tue, 6 Aug 2019 08:39:20 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190806030718.29048-2-luaraneda@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:149.199.60.100;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(4636009)(136003)(396003)(376002)(346002)(39860400002)(2980300002)(189003)(199004)(26005)(426003)(476003)(5660300002)(63266004)(106002)(478600001)(65826007)(9786002)(31686004)(186003)(14444005)(31696002)(50466002)(44832011)(336012)(230700001)(356004)(486006)(11346002)(2616005)(126002)(6246003)(70586007)(8676002)(316002)(64126003)(58126008)(2486003)(52146003)(23676004)(2906002)(305945005)(446003)(76176011)(70206006)(65956001)(81166006)(8936002)(229853002)(4326008)(36386004)(47776003)(65806001)(81156014)(36756003)(5001870100001);DIR:OUT;SFP:1101;SCL:1;SRVR:SN1PR02MB3696;H:xsj-pvapsmtpgw02;FPR:;SPF:Pass;LANG:en;PTR:unknown-60-100.xilinx.com,xapps1.xilinx.com;MX:1;A:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a833b9ca-5cde-4d52-bcb4-08d71a38d8b9 X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(4709080)(1401327)(2017052603328);SRVR:SN1PR02MB3696; X-MS-TrafficTypeDiagnostic: SN1PR02MB3696: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-Forefront-PRVS: 0121F24F22 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Message-Info: VNs2a3X5ASHT+bfPdAzQOEMbshkx5yeQquhNx77lAOG54i4otG4/Mzgxojln94H+zDsUxV7GbgjY7JpSr/ZU5Kr4B/TFaNVFUVFWdNSQ+1RNmYL7Wd7pw/XMALUAIojUUMyfVj0Vu9KtToHkCiPjiDg39VBJOFCVuT16sCCeM+hk35PyYyFPrBRai+0g1s/0HQ/AdYm6nuvL8L7nKttsUovptNkTzVh2m1gI/MywNOoSPKyuWrkQKkzoQ/nrUXXHw4zhlwaDZCg0vhRcAlQphBSVWg/txss8y2xLZkLjgWLyvgPgzHKkHBcOM0XQVA87seo2cl4BSqoht4GNV93hhztUi05isT5uRG1TjvYA7jeDY0VcBfjJJQJo3Mt0zQYjwM+RF3NDE27lLHK4NkUVKX5AF4FCCVEzDRSdLpTwru4= X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2019 06:39:35.0134 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a833b9ca-5cde-4d52-bcb4-08d71a38d8b9 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.60.100];Helo=[xsj-pvapsmtpgw02] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR02MB3696 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06. 08. 19 5:07, Luis Araneda wrote: > Add .arm directive to headsmp.S to ensure that the > CPU starts in 32-bit ARM mode and the correct code > size is copied on smp bring-up > > Additionally, start secondary CPUs on secondary_startup_arm > to automatically switch from ARM to thumb on a thumb kernel > > Suggested-by: Michal Simek > Signed-off-by: Luis Araneda > --- > arch/arm/mach-zynq/headsmp.S | 2 ++ > arch/arm/mach-zynq/platsmp.c | 2 +- > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/mach-zynq/headsmp.S b/arch/arm/mach-zynq/headsmp.S > index ab85003cf9ad..3449e0d1f990 100644 > --- a/arch/arm/mach-zynq/headsmp.S > +++ b/arch/arm/mach-zynq/headsmp.S > @@ -7,6 +7,8 @@ > #include > #include > > + .arm > + > ENTRY(zynq_secondary_trampoline) > ARM_BE8(setend be) @ ensure we are in BE8 mode > ldr r0, zynq_secondary_trampoline_jump > diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c > index a7cfe07156f4..38728badabd4 100644 > --- a/arch/arm/mach-zynq/platsmp.c > +++ b/arch/arm/mach-zynq/platsmp.c > @@ -81,7 +81,7 @@ EXPORT_SYMBOL(zynq_cpun_start); > > static int zynq_boot_secondary(unsigned int cpu, struct task_struct *idle) > { > - return zynq_cpun_start(__pa_symbol(secondary_startup), cpu); > + return zynq_cpun_start(__pa_symbol(secondary_startup_arm), cpu); > } > > /* > It is really a question if this should go to stable tree. It is pretty much new feature. Will be good to also add link to similar patch for example this one 5616f36713ea77f57ae908bf2fef641364403c9f. M