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Miller" , Dinh Nguyen , Geert Uytterhoeven , Gerald Schaefer , Guo Ren , Heiko Carstens , Helge Deller , Huacai Chen , Ingo Molnar , Jiaxun Yang , Johannes Berg , John Paul Adrian Glaubitz , Madhavan Srinivasan , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Stafford Horne , Thomas Bogendoerfer , Thomas Gleixner , Vasily Gorbik , Vineet Gupta , Will Deacon , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [PATCH 10/13] arch, mm: set high_memory in free_area_init() Message-ID: References: <20250306185124.3147510-1-rppt@kernel.org> <20250306185124.3147510-11-rppt@kernel.org> <5e40219b-f149-4e0f-aa10-c09fa183945e@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5e40219b-f149-4e0f-aa10-c09fa183945e@sirena.org.uk> X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7DBD94001B X-Stat-Signature: ncueduqxgjab1efnwnxtrd9f7b6ksh14 X-HE-Tag: 1741730787-997943 X-HE-Meta: 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 jQ8Aa7j6 6t2rtBGUBK004K6fHYDjeJHTIbaO2HVRlJQUaolkjGNAUaWGmqNCiz8/FyjdtpguukiYbuq7kNKpvKUAmy4KNvBJuMSWxAB/0lKJ5lfFleJjSenZlQJPr0+YIryQASTbEQpqHzFh1jCpXwYz3Yyxd9i2RcXc5Q8ExqpXeN0sgRg+5Eeh5pe6Lqtcr2JdiBs0nuCLCitfTfN9XoHV7gxb3jkWqI2yAbkvoMRIPE+YSZxGZRG9OP2kuSoaw/PeIg3diLM/9F7zkhKxEprSvnHFEyZRvMVLfiyJc49pV4tXEnQgsxl9v6TM/xhT3tszxSXVXUe9b1YMKmbuSEQlio4smXUuQjov7D0Nbv8Mvw9P+WmFep2vQZjGGNVYAZCCrT7/AgbXr9j30JfR09w6aYE1w66Z1U02/ph1Y1ondm1ZTgASrKma2hCHPzadkn58z5SgF12Cql+RKgBnwxnubc0w4t02arUsQcaM4xSOhgaRAEP6SWLmZok9HfEkiYUxKlq2EDnptR/HrLL6NrRbym4qeZlap+Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 11, 2025 at 09:33:29PM +0000, Mark Brown wrote: > [ 0.000000] Booting Linux on physical CPU 0x0 > [ 0.000000] Linux version 6.14.0-rc6-next-20250311 (tuxmake@tuxmake) (arm-linux-gnueabihf-gcc (Debian 13.3.0-5) 13.3.0, GNU ld (GNU Binutils for Debian) 2.43.1) #1 SMP @1741691801 > [ 0.000000] CPU: ARMv7 Processor [414fc0f0] revision 0 (ARMv7), cr=10c5387d > [ 0.000000] CPU: div instructions available: patching division code > [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache > [ 0.000000] OF: fdt: Machine model: linux,dummy-virt > [ 0.000000] random: crng init done > [ 0.000000] earlycon: pl11 at MMIO 0x09000000 (options '') > [ 0.000000] printk: legacy bootconsole [pl11] enabled > [ 0.000000] Memory policy: Data cache writealloc > [ 0.000000] efi: UEFI not found. > [ 0.000000] cma: Reserved 64 MiB at 0x00000000 If that CMA address is correct, then it's wrong. virt machines start DRAM at 0x40000000. This is a small memory VM: [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x0000000040000000-0x0000000045ffffff] [ 0.000000] HighMem empty and this is a larger memory VM: [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x0000000040000000-0x000000006fffffff] [ 0.000000] HighMem [mem 0x0000000070000000-0x000000007fffffff] Neither have CMA enabled (it's not necessary for a VM). On a real platform where CMA and highmem is enabled, then: [ 0.000000] cma: Reserved 16 MiB at 0x4f000000 on node -1 [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x0000000010000000-0x000000003fffffff] [ 0.000000] HighMem [mem 0x0000000040000000-0x000000004fffffff] So that "cma:" line you are seeing is indicating that something is very very wrong - it should definitely not be zero. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!