Good morning. On 05/01/2018 06:00 AM, changbin.du@xxxxxxxxx wrote: > From: Changbin Du <changbin.du@xxxxxxxxx> > > > Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx> > --- > Makefile | 4 ++++ > include/linux/compiler-gcc.h | 2 +- > include/linux/compiler.h | 2 +- > lib/Kconfig.debug | 21 +++++++++++++++++++++ > 4 files changed, 27 insertions(+), 2 deletions(-) > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 90f35ad..2432e77d 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -211,6 +211,27 @@ config NO_AUTO_INLINE > > Use only if you want to debug the kernel. > > +config DEBUG_EXPERIENCE > + bool "Optimize for better debugging experience (-Og)" > + default n > + select NO_AUTO_INLINE > + depends on !CC_OPTIMIZE_FOR_SIZE > + help > + This will apply GCC '-Og' optimization level get supported from which is supported since > + GCC 4.8. This optimization level offers a reasonable level of > + optimization while maintaining fast compilation and a good > + debugging experience. It is similar to '-O1' while perfer keeping while preferring to keep > + debug ability over runtime speed. The overall performance will > + drop a bit. > + > + If enabling this option break your kernel, you should either breaks > + disable this or find a fix (mostly in the arch code). Currently > + this option has only be tested in qemu x86_64 guest. > + > + Use only if you want to debug the kernel, especially if you want > + to have better kernel debugging experience with gdb facilities > + like kgdb and qemu. > + > config ENABLE_WARN_DEPRECATED > bool "Enable __deprecated logic" > default y > thanks, -- ~Randy
