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Message-ID: <62ea9838-70ce-ca73-7dae-e94620956ab5@gmail.com>
Date: Mon, 16 Nov 2020 12:08:26 +0300
From: Sergei Shtylyov <sergei.shtylyov@...il.com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [RFC PATCH] MIPS: Kconfig: Select ARCH_WANT_FRAME_POINTERS
Hello!
On 16.11.2020 8:03, 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? :-)
> the frame information in registers or on the stack at different points
> which allows a debugger such as gdb to more accurately construct stack
> back traces while debugging the kernel.
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
[...]
MBR, Sergei
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