From: Michal Kubecek <mkubecek@suse.cz>
To: Masahiro Yamada <yamada.masahiro@socionext.com>,
Michal Marek <michal.lkml@markovi.net>
Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Andreas Faerber <afaerber@suse.com>
Subject: [PATCH] Makefile: disable PIE before testing asm goto
Date: Wed, 16 May 2018 07:51:36 +0200 (CEST) [thread overview]
Message-ID: <20180516055136.6F4EAA095A@unicorn.suse.cz> (raw)
Since commit e501ce957a78 ("x86: Force asm-goto"), aarch64 build on
distributions which enable PIE by default (e.g. openSUSE Tumbleweed) does
not detect support for asm goto correctly. The problem is that ARM specific
part of scripts/gcc-goto.sh fails with PIE even with recent gcc versions.
Moving the asm goto detection up in Makefile put it before the place where
we disable PIE. As a result, kernel is built without jump label support.
Move the lines disabling PIE before the asm goto test to make it work.
Fixes: e501ce957a78 ("x86: Force asm-goto")
Reported-by: Andreas Faerber <afaerber@suse.com>
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index ba3106b36597..5532a15c4781 100644
--- a/Makefile
+++ b/Makefile
@@ -500,6 +500,9 @@ RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
export RETPOLINE_CFLAGS
+KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
+KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
+
# check for 'asm goto'
ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
CC_HAVE_ASM_GOTO := 1
@@ -621,8 +624,6 @@ endif # $(dot-config)
# Defaults to vmlinux, but the arch makefile usually adds further targets
all: vmlinux
-KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
-KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
export CFLAGS_GCOV CFLAGS_KCOV
--
2.16.3
next reply other threads:[~2018-05-16 5:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-16 5:51 Michal Kubecek [this message]
2018-05-16 8:16 ` [PATCH] Makefile: disable PIE before testing asm goto Peter Zijlstra
2018-05-17 13:34 ` Masahiro Yamada
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