On Wed, Jun 24, 2020 at 1:58 PM Nick Desaulniers
[off-list ref] wrote:

On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen [off-list ref] wrote:

quoted

Filter out CC_FLAGS_LTO for the vDSO.

Just curious about this patch (and the following one for x86's vdso),
do you happen to recall specifically what the issues with the vdso's
are?

+ Andi (tangential, I actually have a bunch of tabs open with slides
from http://halobates.de/ right now)
58edae3aac9f2
67424d5a22124
$ git log -S DISABLE_LTO

quoted

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
 arch/arm64/kernel/vdso/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index 556d424c6f52..cfad4c296ca1 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile

@@ -29,8 +29,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
 ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
 ccflags-y += -DDISABLE_BRANCH_PROFILING

-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
-KBUILD_CFLAGS                  += $(DISABLE_LTO)
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) \
+                               $(CC_FLAGS_LTO)
 KASAN_SANITIZE                 := n
 UBSAN_SANITIZE                 := n
 OBJECT_FILES_NON_STANDARD      := y
--

-- 
Thanks,
~Nick Desaulniers

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