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authorPalmer Dabbelt <palmer@rivosinc.com>2023-02-23 23:46:05 +0100
committerPalmer Dabbelt <palmer@rivosinc.com>2023-03-07 00:55:25 +0100
commite18048da9bc3f87acef4eb67a11b4fc55fe15424 (patch)
tree653cbfbf13c95b430174135cf35881dbf222c895 /arch/riscv
parentLinux 6.3-rc1 (diff)
downloadlinux-e18048da9bc3f87acef4eb67a11b4fc55fe15424.tar.xz
linux-e18048da9bc3f87acef4eb67a11b4fc55fe15424.zip
RISC-V: Stop emitting attributes
The RISC-V ELF attributes don't contain any useful information. New toolchains ignore them, but they frequently trip up various older/mixed toolchains. So just turn them off. Tested-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230223224605.6995-1-palmer@rivosinc.com Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv')
-rw-r--r--arch/riscv/Makefile7
-rw-r--r--arch/riscv/kernel/compat_vdso/Makefile4
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 6203c3378922..4de83b9b1772 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -84,6 +84,13 @@ endif
# Avoid generating .eh_frame sections.
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
+# The RISC-V attributes frequently cause compatibility issues and provide no
+# information, so just turn them off.
+KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
+KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
+KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
+KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
+
KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
diff --git a/arch/riscv/kernel/compat_vdso/Makefile b/arch/riscv/kernel/compat_vdso/Makefile
index 260daf3236d3..7f34f3c7c882 100644
--- a/arch/riscv/kernel/compat_vdso/Makefile
+++ b/arch/riscv/kernel/compat_vdso/Makefile
@@ -14,6 +14,10 @@ COMPAT_LD := $(LD)
COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32
COMPAT_LD_FLAGS := -melf32lriscv
+# Disable attributes, as they're useless and break the build.
+COMPAT_CC_FLAGS += $(call cc-option,-mno-riscv-attribute)
+COMPAT_CC_FLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
+
# Files to link into the compat_vdso
obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o