On Tue, Aug 19, 2014 at 10:19 PM, Thomas Meyer <[email protected]> wrote: > Hi. > > Thanks for your answer. > > There goes my plan to better understand an UML kernel lock up by using a > debugger... Everything gets optimised out with -O2 :-(
Is it the filesystem/block lockup you saw some time ago? Maybe Thorsten can give more details. He sent me an patch off list a few days ago. > Can you give an example function that relies on this GCC feature? > > With kind regards > Thomas > > Am 19.08.2014 22:06 schrieb [email protected]: >> >> On Tue, 19 Aug 2014 21:12:10 +0200, Thomas Meyer said: >> > > Hi, >> > > >> > > the build with -O0 fails with: >> >> > > bug or feature? >> > > >> > > any ideas? >> >> Feature. The kernel is *known* to not build with -O0, because that >> disables *all* function inlining, and there's several functions that *have* >> to be inlined in order to function properly (most notably, anything >> that uses the gcc __builtin_return_address in a function that is expected >> to be inlined). -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
