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Thu, 12 Nov 2026 11:30:45 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 X-ThreadId: AMahpuQ4Atds Date: Thu, 12 Nov 2026 17:30:25 +0100 From: "Arnd Bergmann" To: "kernel test robot" Cc: oe-kbuild-all@lists.linux.dev, linuxppc-dev@lists.ozlabs.org Message-Id: In-Reply-To: <202611121726.xboRqpix-lkp@intel.com> References: <202611121726.xboRqpix-lkp@intel.com> Subject: Re: [arnd-playground:highmem-7.4 5/6] arch/powerpc/mm/init_32.c:49:2: error: #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, Nov 12, 2026, at 17:13, kernel test robot wrote: > > If you fix the issue in a separate patch/commit (i.e. not just a new > version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: > https://lore.kernel.org/oe-kbuild-all/202611121726.xboRqpix-lkp@intel.com/ > > All errors (new ones prefixed by >>): > >>> arch/powerpc/mm/init_32.c:49:2: error: #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" > #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" > ^~~~~ The randconfig file contains # CONFIG_LOWMEM_SIZE_BOOL is not set CONFIG_LOWMEM_SIZE=0x80000000 CONFIG_PAGE_OFFSET_BOOL=y CONFIG_PAGE_OFFSET=0xc0000000 CONFIG_KERNEL_START_BOOL=y CONFIG_KERNEL_START=0xc0000000 which is an invalid configuration My patch changed the defaults for both PAGE_OFFSET and LOWMEM_SIZE in a way that should still work: config LOWMEM_SIZE hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL - default "0x30000000" + default "0x80000000" if HIGHMEM + default "0x40000000" config PAGE_OFFSET hex "Virtual address of memory base" if PAGE_OFFSET_BOOL - default "0xc0000000" + default "0x70000000" if HIGHMEM + default "0xb0000000" What I'm guessing happened is that the .config file was generated with the old defaults by running 'make randconfig' on an unpatched tree, but then running 'make olddefconfig' changes the default for LOWMEM_SIZE without changing the others. Arnd