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Subject[PATCH] x86: add the flag -fno-reorder-blocks-and-partition
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 <mpatocka@redhat.com>
Cc: stable@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,)

ifeq ($(CONFIG_X86_32),y)
BITS := 32
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