From: Fangrui Song
Object files used to link .tmp_vmlinux.kallsyms1 have many R_PPC64_ADDR64
relocations in non-SHF_WRITE sections. There are many text relocations (e.g. in
.rela___ksymtab_gpl+* and .rela__mcount_loc sections) in a -pie link and are
disallowed by LLD:
ld.lld: error: can't create dynamic relocation R_PPC64_ADDR64 against local
symbol in readonly segment; recompile object files with -fPIC or pass
'-Wl,-z,notext' to allow text relocations in the output
>>> defined in arch/powerpc/kernel/head_64.o
>>> referenced by arch/powerpc/kernel/head_64.o:(__restart_table+0x10)
Newer GNU ld configured with "--enable-textrel-check=error" will report an
error as well:
$ ld-new -EL -m elf64lppc -pie ... -o .tmp_vmlinux.kallsyms1 ...
ld-new: read-only segment has dynamic relocations
Add "-z notext" to suppress the errors. Non-CONFIG_RELOCATABLE builds use the
default -no-pie mode and thus R_PPC64_ADDR64 relocations can be resolved at
link-time.
Link: https://github.com/ClangBuiltLinux/linux/issues/811
Signed-off-by: Fangrui Song
Co-developed-by: Bill Wendling
Signed-off-by: Bill Wendling
Reported-by: Itaru Kitayama
Reviewed-by: Nick Desaulniers
---
v2:
- Assign "Fangrui Song" as the proper author.
- Improve the commit message to add more context.
- Appending tags from original patch's review.
---
arch/powerpc/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 6505d66f1193..17a9fbf9b789 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -122,6 +122,7 @@ endif
LDFLAGS_vmlinux-y := -Bstatic
LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
+LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
LDFLAGS_vmlinux:= $(LDFLAGS_vmlinux-y)
ifdef CONFIG_PPC64
--
2.33.0.rc1.237.g0d66db33f3-goog
