http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59644
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Weird, I thought the kernel is compiled even with -mno-sse, so there shouldn't be AVX used and thus no need for realignment anywhere. What arch is that? i?86 or x86_64? Can you bisect which *.o file matters for this, and attach the preprocessed source plus command line options? Perhaps start with comparison of *.o files between r206242 and r206243? I'd be really surprised if it on the kernel made a difference on many source files.