[PATCH AUTOSEL 4.19 065/258] powerpc/32: Add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly
From: Sasha Levin
Date: Mon Jan 28 2019 - 11:02:37 EST
From: Mathieu Malaterre <malat@xxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxxx/msg135407.html
Suggested-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Mathieu Malaterre <malat@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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)
--
2.19.1