[PATCH v3 1/3] powerpc: Discard more sections in linker script

[Joel Stanley]

Building the ppc64 kernel with a modern binutils results in this
warning:

 powerpc64le-linux-gnu-ld: warning: orphan section `.gnu.hash' from
 `linker stubs' being placed in section `.gnu.hash'

Alan Modra <amodra at gmail.com> explains:

 > .gnu.hash, like .hash, is used by glibc ld.so for dynamic symbol
 > lookup.  I imagine you don't need either section in a kernel, so
 > discarding both sounds reasonable.  Likely you could discard .interp
 > and .dynstr too, and .dynsym when !CONFIG_PPC32.

Reported-by: Stephen Rothwell <sfr at canb.auug.org.au>
Signed-off-by: Joel Stanley <joel at jms.id.au>
---
See https://lore.kernel.org/lkml/CACPK8Xft3n5KkpTjN3=7_VUCXHFcK7mxvZm2Rrqu7tppcBoyOg@mail.gmail.com/T/#m58532c86cf0c7b4fb01cc1fe724e48d4c7d8e4a7

v3: Add dynstr hunk to this patch (it was incorrectly left in patch 2)
---
 arch/powerpc/kernel/vmlinux.lds.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 434581bcd5b4..779b8b3075a1 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -273,14 +273,11 @@ SECTIONS
 #endif
 		*(.dynsym)
 	}
-	.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 	.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 	{
 		__dynamic_start = .;
 		*(.dynamic)
 	}
-	.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
-	.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 	.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 	{
 		__rela_dyn_start = .;
@@ -388,5 +385,8 @@ SECTIONS
 		*(.gnu.version*)
 		*(.gnu.attributes)
 		*(.eh_frame)
+		*(.hash .gnu.hash)
+		*(.interp)
+		*(.dynstr)
 	}
 }
-- 
2.19.1