On 2014.07.26 at 11:39 -0700, Linus Torvalds wrote: > On Sat, Jul 26, 2014 at 11:28 AM, Linus Torvalds > <torva...@linux-foundation.org> wrote: > > > > That's a bit worrisome. I haven't actually checked if the code > > generation differs in significant ways yet.. > > Nope. Just three instructions that got re-ordered from ABC to CAB in a > way that makes no difference. But just the knowledge that "-g" affects > code generation is nasty. And with "allmodconfig" my build fails > almost immediately (failures on at least arch/x86/kernel/process_64.c, > kernel/exit.c and mm/vmalloc.c in that case. I was too lazy to check > what the differences were). > > Does anybody have current gcc build and can verify that current gcc > tip passes the kernel compile with that > > export GCC_COMPARE_DEBUG=1 > > thing?
The fs/ext4/inode.c issue is a variant of the gcc bug and isn't fixed yet. I will open a bug report. The kernel/exit.c issue is already fixed, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 for a reduced testcase. But fortunately the workaround for the new inode.c bug is the same as for the original bug: -fno-var-tracking-assignments. It would make sense to enabled it unconditionally for all debug configurations for now. -- Markus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
