linux-kernel - [PATCH] x86: add the flag -fno-reorder-blocks-and-partition

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Date:   Tue, 15 May 2018 01:23:47 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
cc:     x86@...nel.org, linux-kernel@...r.kernel.org
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@...hat.com>
Cc: stable@...r.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