From: Wende Tan <twd2.me@gmail.com>
To: palmer@dabbelt.com, paul.walmsley@sifive.com,
aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org
Cc: Wende Tan <twd2.me@gmail.com>, clang-built-linux@googlegroups.com
Subject: [PATCH 2/3] RISC-V: build: Disable LTO for the vDSO
Date: Mon, 19 Jul 2021 20:53:14 +0000 [thread overview]
Message-ID: <20210719205314.1023455-1-twd2.me@gmail.com> (raw)
Disable LTO for the vDSO as done for x86 [1] and arm64 [2]. This also
disables CFI for it [3].
[1] https://patchwork.kernel.org/project/linux-kbuild/patch/20201009161338.657380-28-samitolvanen@google.com/
[2] https://patchwork.kernel.org/project/kernel-hardening/patch/20201211184633.3213045-15-samitolvanen@google.com/
[3] https://lore.kernel.org/bpf/CABCJKucpFHC-9rvT7uNF+E-Jh20fz69zdO49_4p8G_Sb634qmw@mail.gmail.com/
Signed-off-by: Wende Tan <twd2.me@gmail.com>
---
arch/riscv/kernel/vdso/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 24d936c147cd..4535a77792be 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -30,7 +30,7 @@ obj-y += vdso.o vdso-syms.o
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
# Disable -pg to prevent insert call site
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_LTO)
# Disable profiling and instrumentation for VDSO code
GCOV_PROFILE := n
--
2.25.1
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next reply other threads:[~2021-07-19 20:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 20:53 Wende Tan [this message]
2021-07-19 21:19 ` [PATCH 2/3] RISC-V: build: Disable LTO for the vDSO Nick Desaulniers
2021-07-20 9:47 ` twd2
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