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([2a00:1fa0:2fb:950d:1831:3fc8:8cb7:2cac]) by smtp.gmail.com with ESMTPSA id w10sm2672051ljm.56.2020.11.16.02.09.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Nov 2020 02:09:33 -0800 (PST) Subject: Re: [RFC PATCH] MIPS: Kconfig: Select ARCH_WANT_FRAME_POINTERS To: Tiezhu Yang , Thomas Bogendoerfer Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Xuefeng Li References: <1605502980-31946-1-git-send-email-yangtiezhu@loongson.cn> <62ea9838-70ce-ca73-7dae-e94620956ab5@gmail.com> From: Sergei Shtylyov Organization: Brain-dead Software Message-ID: <9b6318d8-1112-d271-b775-209ccc526fcf@gmail.com> Date: Mon, 16 Nov 2020 13:09:28 +0300 User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.4.3 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16.11.2020 12:47, Tiezhu Yang wrote: [...] >>> Select ARCH_WANT_FRAME_POINTERS to fix the following build error under >>> CONFIG_DEBUG_ATOMIC_SLEEP: >>> >>>    CC      arch/mips/kernel/signal.o >>> {standard input}: Assembler messages: >>> {standard input}:1775: Error: Unable to parse register name $fp >>> scripts/Makefile.build:283: recipe for target 'arch/mips/kernel/signal.o' >>> failed >>> make[2]: *** [arch/mips/kernel/signal.o] Error 1 >>> scripts/Makefile.build:500: recipe for target 'arch/mips/kernel' failed >>> make[1]: *** [arch/mips/kernel] Error 2 >>> Makefile:1799: recipe for target 'arch/mips' failed >>> make: *** [arch/mips] Error 2 >>> >>> I think it is useful to get debugging information as described in the >>> following texts: >>> >>> lib/Kconfig.debug >>> config FRAME_POINTER >>>          bool "Compile the kernel with frame pointers" >>>          ... >>>          default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS >>>          help >>>            If you say Y here the resulting kernel image will be slightly >>>            larger and slower, but it gives very useful debugging information >>>            in case of kernel bugs. (precise oopses/stacktraces/warnings) >>> >>> Documentation/dev-tools/kgdb.rst >>> This option inserts code to into the compiled executable which saves >> >>    So to or into? :-) > > Hi Sergei, > > Thanks for pointing that out，this may be a typo which should be "into". Oops, I didn't realize it was a quote from the KGDB docs... :-) > I will update the commit message to correct it. Thank you! > Thanks, > Tiezhu [...] MBR, Sergei