powerpc/vmlinux.lds: Explicitly retain .gnu.hash

Relocatable kernel builds produce a warning about .gnu.hash being an
orphan section:

  ld: warning: orphan section `.gnu.hash' from `linker stubs' being placed in section `.gnu.hash'

If we try to discard it the build fails:

  ld -EL -m elf64lppc -pie --orphan-handling=warn --build-id -o
    .tmp_vmlinux1 -T ./arch/powerpc/kernel/vmlinux.lds --whole-archive
    arch/powerpc/kernel/head_64.o arch/powerpc/kernel/entry_64.o
    ...
    sound/built-in.a net/built-in.a virt/built-in.a --no-whole-archive
    --start-group lib/lib.a --end-group
  ld: could not find section .gnu.hash

So add an entry to explicitly retain it, as we do for .hash.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200227045933.22967-1-mpe@ellerman.id.au

diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index a32d478a7f41de22c1841262790ca60fc72ca376..b17d665a4e07f9a2ac250202d7fa930a6ad1495d 100644 (file)
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -256,6 +256,7 @@ SECTIONS
                *(.dynamic)
        }
        .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
+       .gnu.hash : AT(ADDR(.gnu.hash) - LOAD_OFFSET) { *(.gnu.hash) }
        .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
        .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
        {