4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit beba24ac59133cb36ecd03f9af9ccb11971ee20e ]
When both `CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y` and `CONFIG_UBSAN=y` are set, link step typically produce numberous warnings about orphan section:
+ powerpc-linux-gnu-ld -EB -m elf32ppc -Bstatic --orphan-handling=warn --build-id --gc-sections -X -o .tmp_vmlinux1 -T ./arch/powerpc/kernel/vmlinux.lds --who le-archive built-in.a --no-whole-archive --start-group lib/lib.a --end-group powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data393' from `init/main.o' being placed in section `.data..Lubsan_data393'. powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data394' from `init/main.o' being placed in section `.data..Lubsan_data394'. ... powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_type11' from `init/main.o' being placed in section `.data..Lubsan_type11'. powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_type12' from `init/main.o' being placed in section `.data..Lubsan_type12'. ...
This commit remove those warnings produced at W=1.
Link: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg135407.html Suggested-by: Nicholas Piggin npiggin@gmail.com Signed-off-by: Mathieu Malaterre malat@debian.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/vmlinux.lds.S | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 07ae018e550e..53016c753f3c 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -296,6 +296,10 @@ SECTIONS #ifdef CONFIG_PPC32 .data : AT(ADDR(.data) - LOAD_OFFSET) { DATA_DATA +#ifdef CONFIG_UBSAN + *(.data..Lubsan_data*) + *(.data..Lubsan_type*) +#endif *(.data.rel*) *(SDATA_MAIN) *(.sdata2)