Commit 34f6e38f authored Aug 18, 2023 by Daniel T. Lee Committed by Alexei Starovoitov Aug 21, 2023

samples/bpf: fix warning with ignored-attributes



Currently, compiling the bpf programs will result the warning with the
ignored attribute as follows. This commit fixes the warning by adding
cf-protection option.

    In file included from ./arch/x86/include/asm/linkage.h:6:
    ./arch/x86/include/asm/ibt.h:77:8: warning: 'nocf_check' attribute ignored; use -fcf-protection to enable the attribute [-Wignored-attributes]
    extern __noendbr u64 ibt_save(bool disable);
           ^
    ./arch/x86/include/asm/ibt.h:32:34: note: expanded from macro '__noendbr'
                                       ^

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230818090119.477441-2-danieltimlee@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>

parent 5bebd3e3

samples/bpf/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -440,7 +440,7 @@ $(obj)/%.o: $(src)/%.c
	-Wno-gnu-variable-sized-type-not-at-end \		-Wno-gnu-variable-sized-type-not-at-end \
	-Wno-address-of-packed-member -Wno-tautological-compare \		-Wno-address-of-packed-member -Wno-tautological-compare \
	-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \		-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
	-fno-asynchronous-unwind-tables \		-fno-asynchronous-unwind-tables -fcf-protection \
	-I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \		-I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \
	-O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - \| \		-O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - \| \
	$(OPT) -O2 -mtriple=bpf-pc-linux \| $(LLVM_DIS) \| \		$(OPT) -O2 -mtriple=bpf-pc-linux \| $(LLVM_DIS) \| \