diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl index e8acd1f03456..54d3b158d080 100644 --- a/Documentation/DocBook/kgdb.tmpl +++ b/Documentation/DocBook/kgdb.tmpl @@ -98,6 +98,14 @@ "Kernel debugging" select "KGDB: kernel debugging with remote gdb". + It is advised, but not required that you turn on the + CONFIG_FRAME_POINTER kernel option. This option inserts code to + into the compiled executable which saves the frame information in + registers or on the stack at different points which will allow a + debugger such as gdb to more accurately construct stack back traces + while debugging the kernel. + + Next you should choose one of more I/O drivers to interconnect debugging host and debugged target. Early boot debugging requires a KGDB I/O driver that supports early debugging and the driver must be diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb index 2cfd2721f7ed..9b5d1d7f2ef7 100644 --- a/lib/Kconfig.kgdb +++ b/lib/Kconfig.kgdb @@ -4,14 +4,17 @@ config HAVE_ARCH_KGDB menuconfig KGDB bool "KGDB: kernel debugging with remote gdb" - select FRAME_POINTER depends on HAVE_ARCH_KGDB depends on DEBUG_KERNEL && EXPERIMENTAL help If you say Y here, it will be possible to remotely debug the - kernel using gdb. Documentation of kernel debugger is available - at http://kgdb.sourceforge.net as well as in DocBook form - in Documentation/DocBook/. If unsure, say N. + kernel using gdb. It is recommended but not required, that + you also turn on the kernel config option + CONFIG_FRAME_POINTER to aid in producing more reliable stack + backtraces in the external debugger. Documentation of + kernel debugger is available at http://kgdb.sourceforge.net + as well as in DocBook form in Documentation/DocBook/. If + unsure, say N. if KGDB