On 11/16/2020 11:14 PM, Thomas Bogendoerfer wrote:
On Mon, Nov 16, 2020 at 05:55:06PM +0800, 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 2I don't see this error and to me it looks strange to fix that with enablding frame pointers... What gcc is this ?
I found this build error used with gcc 4.9.4. I try it used with gcc 7.3.1 and it has no problem. We can use new gcc version to avoid this build error. Additionally, I want to know whether ARCH_WANT_FRAME_POINTERS is necessary for MIPS to get more debugging info, with this config we can enable the config FRAME_POINTER by default and disable it manually. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile#n790 ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls Thanks, Tiezhu
