On Mon, Oct 29, 2018 at 10:16:02PM +0900, Masahiro Yamada wrote: > On Sun, Oct 28, 2018 at 10:11 PM Changbin Du <changbin.du@xxxxxxxxx> wrote: > > > > This will apply GCC '-Og' optimization level 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 perferring > > to keep debug ability over runtime speed. > > > > If enabling this option breaks your kernel, you should either > > disable this or find a fix (mostly in the arch code). Currently > > this option has only been tested on x86_64 and arm platform. > > > > This option can satisfy people who was searching for a method > > to disable compiler optimizations so to achieve better kernel > > debugging experience with kgdb or qemu. > > > > The main problem of '-Og' is we must not use __attribute__((error(msg))). > > The compiler will report error though the call to error function > > still can be optimize out. So we must fallback to array tricky. > > > I removed the sentence "So we must fallback to array tricky." > > Commit 81b45683487a51b0f4d3b29d37f20d6d078544e4 > killed the fallback to the negative array trick. > > > I also resolved a conflict. > > Your series is now available in the following branch. > > git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild kbuild > > > Please double check if I did it correctly. > I have tested your kbuild branch and no issues found. Thanks for checking this series! > > -- > Best Regards > Masahiro Yamada -- Thanks, Changbin Du
