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Fri, 12 Feb 2021 03:21:41 +0000 (GMT) References: <202102120032.Bv0MoYv7-lkp@intel.com> <40fd1869-dcb4-36ae-e997-b8486dd4846c@linux.microsoft.com> <87mtwap35f.fsf@manicouagan.localdomain> <87eehmox08.fsf@manicouagan.localdomain> User-agent: mu4e 1.4.10; emacs 27.1 From: Thiago Jung Bauermann To: Lakshmi Ramasubramanian Subject: Re: Fwd: Re: [PATCH v17 02/10] of: Add a common kexec FDT setup function In-reply-to: Date: Fri, 12 Feb 2021 00:21:39 -0300 Message-ID: <87blcqotrw.fsf@manicouagan.localdomain> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.737 definitions=2021-02-11_07:2021-02-11, 2021-02-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 malwarescore=0 phishscore=0 spamscore=0 clxscore=1015 adultscore=0 suspectscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102120018 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210211_222149_328670_2F26C8F9 X-CRM114-Status: GOOD ( 24.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , linux-integrity@vger.kernel.org, linuxppc-dev , linux-arm-kernel , Mimi Zohar Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Lakshmi Ramasubramanian writes: > On 2/11/21 6:11 PM, Thiago Jung Bauermann wrote: >> Lakshmi Ramasubramanian writes: >> >>> On 2/11/21 3:59 PM, Thiago Jung Bauermann wrote: >>>> Lakshmi Ramasubramanian writes: >>>> >>>>> On 2/11/21 9:42 AM, Lakshmi Ramasubramanian wrote: >>>>>> Hi Rob, >>>>>> [PATCH] powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem >>>>>> This change causes build problem for x86_64 architecture (please see the >>>>>> mail from kernel test bot below) since arch/x86/include/asm/kexec.h uses >>>>>> "elf_load_addr" for the ELF header buffer address and not >>>>>> "elf_headers_mem". >>>>>> struct kimage_arch { >>>>>> ... >>>>>> /* Core ELF header buffer */ >>>>>> void *elf_headers; >>>>>> unsigned long elf_headers_sz; >>>>>> unsigned long elf_load_addr; >>>>>> }; >>>>>> I am thinking of limiting of_kexec_alloc_and_setup_fdt() to ARM64 and >>>>>> PPC64 since they are the only ones using this function now. >>>>>> #if defined(CONFIG_ARM64) && defined(CONFIG_PPC64) >>>>> Sorry - I meant to say >>>>> #if defined(CONFIG_ARM64) || defined(CONFIG_PPC64) >>>>> >>>> Does it build correctly if you rename elf_headers_mem to elf_load_addr? >>>> Or the other way around, renaming x86's elf_load_addr to >>>> elf_headers_mem. I don't really have a preference. >>> >>> Yes - changing arm64 and ppc from "elf_headers_mem" to "elf_load_addr" builds >>> fine. >>> >>> But I am concerned about a few other architectures that also define "struct >>> kimage_arch" such as "parisc", "arm" which do not have any ELF related fields. >>> They would not build if the config defines CONFIG_KEXEC_FILE and >>> CONFIG_OF_FLATTREE. >>> >>> Do you think that could be an issue? >> That's a good point. But in practice, arm doesn't support >> CONFIG_KEXEC_FILE. And while parisc does support CONFIG_KEXEC_FILE, as >> far as I could determine it doesn't support CONFIG_OF. >> So IMHO we don't need to worry about them. We'll cross that bridge if we >> get there. If they ever implement KEXEC_FILE or OF_FLATTREE support, >> then (again, IMHO) the natural solution would be for them to name the >> ELF header member the same way the other arches do. >> And since no other architecture defines struct kimage_arch, those are >> the only ones we need to consider. >> > > Sounds good Thiago. > > I'll rename arm64 and ppc kimage_arch ELF address field to match that defined > for x86/x64. > > Also, will add "fdt_size" param to of_kexec_alloc_and_setup_fdt(). For now, I'll > use 2*fdt_totalsize(initial_boot_params) for ppc. > > Will send the updated patches shortly. Sounds good. There will be a small conflict with powerpc/next because of the patch I mentioned, but it's simple to fix by whoever merges the series. -- Thiago Jung Bauermann IBM Linux Technology Center _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel