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| author | Michal Kubecek <mkubecek@suse.cz> | 2018-05-16 07:51:36 +0200 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-05-17 22:36:40 +0900 |
| commit | 8438ee76b004ef66d125ade64c91fc128047d244 (patch) | |
| tree | 3c174fe99238cf40d957fc4bb4844019226ed0a7 /Makefile | |
| parent | c64ba044ed57ea72cc1c7b14a8dcfb6ded5a759c (diff) | |
| download | lwn-8438ee76b004ef66d125ade64c91fc128047d244.tar.gz lwn-8438ee76b004ef66d125ade64c91fc128047d244.zip | |
Makefile: disable PIE before testing asm goto
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>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 5 |
1 files changed, 3 insertions, 2 deletions
@@ -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 \ $(call cc-option,-fno-tree-loop-im) \ $(call cc-disable-warning,maybe-uninitialized,) |