* Mikulas Patocka <mpato...@redhat.com> wrote:
> GCC 8 turns on -freorder-blocks-and-partition by default, the ORC unwinder
> can't deal with it and it results in a lot of warnings "sibling call from
> callable instruction with modified stack frame". This patch adds the
> -fno-reorder-blocks-and-partition option to KBUILD_CFLAGS.
>
> Signed-off-by: Mikulas Patocka <mpato...@redhat.com>
> Cc: sta...@vger.kernel.org
>
> ---
> arch/x86/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> Index: linux-2.6/arch/x86/Makefile
> ===================================================================
> --- linux-2.6.orig/arch/x86/Makefile 2018-05-15 07:19:40.000000000 +0200
> +++ linux-2.6/arch/x86/Makefile 2018-05-15 07:19:40.000000000 +0200
> @@ -59,6 +59,7 @@ endif
> #
> KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
> KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
> +KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks-and-partition,)
Could you check whether the latest objtool fixes in -tip:
git git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git master
solves those warnings?
Thanks,
Ingo
