linux-kernel - [PATCH 3.12 071/127] kbuild: add -fno-PIE

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Date:   Fri, 25 Nov 2016 09:29:44 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Michal Marek <mmarek@...e.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 071/127] kbuild: add -fno-PIE

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 8ae94224c9d72fc4d9aaac93b2d7833cf46d7141 upstream.

Debian started to build the gcc with -fPIE by default so the kernel
build ends before it starts properly with:
|kernel/bounds.c:1:0: error: code model kernel does not support PIC mode

Also add to KBUILD_AFLAGS due to:

|gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S
|arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic

Tagging it stable so it is possible to compile recent stable kernels as
well.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Michal Marek <mmarek@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 32dbd8513eee..7b106de05fef 100644
--- a/Makefile
+++ b/Makefile
@@ -583,6 +583,8 @@ endif # $(dot-config)
 all: vmlinux
 
 KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
+KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS	+= -Os
-- 
2.10.2