[PATCH] ppc: add "-z notext" flag to disable diagnostic

[Bill Wendling]

The "-z notext" flag disables reporting an error if DT_TEXTREL is set on
PPC with CONFIG=kdump:

  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 built-in.a(arch/powerpc/kernel/misc.o)
  >>> referenced by arch/powerpc/kernel/misc.o:(.text+0x20) in archive
      built-in.a

The BFD linker disables this by default (though it's configurable in
current versions). LLD enables this by default. So we add the flag to
keep LLD from emitting the error.

Signed-off-by: Bill Wendling <morbo at google.com>

---
The output of the "get_maintainer.pl" run just in case no one believes me. :-)

$ ./scripts/get_maintainer.pl arch/powerpc/Makefile
Michael Ellerman <mpe at ellerman.id.au> (supporter:LINUX FOR POWERPC (32-BIT AND 64-BIT))
Benjamin Herrenschmidt <benh at kernel.crashing.org> (reviewer:LINUX FOR POWERPC (32-BIT AND 64-BIT))
Paul Mackerras <paulus at samba.org> (reviewer:LINUX FOR POWERPC (32-BIT AND 64-BIT))
Nathan Chancellor <nathan at kernel.org> (supporter:CLANG/LLVM BUILD SUPPORT)
Nick Desaulniers <ndesaulniers at google.com> (supporter:CLANG/LLVM BUILD SUPPORT)
linuxppc-dev at lists.ozlabs.org (open list:LINUX FOR POWERPC (32-BIT AND 64-BIT))
linux-kernel at vger.kernel.org (open list)
clang-built-linux at googlegroups.com (open list:CLANG/LLVM BUILD SUPPORT)
---
 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