From cbac9bda67f107ec39383d936380ffe9f5f67cdc Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 31 May 2013 22:50:47 +0100 Subject: ARM: 7743/1: compressed/head.S: work around new binutils warning commit da94a829305f1c217cfdf6771cb1faca0917e3b9 upstream. In August 2012, Matthew Gretton-Dann checked a change into binutils labelled "Error on obsolete & warn on deprecated registers", apparently as part of ARMv8 support. Apparently, this was supposed to emit the message "Warning: This coprocessor register access is deprecated in ARMv8" when using certain mcr/mrc instructions and building for ARMv8. Unfortunately, the message that is actually emitted appears to be '(null)', which is less helpful in comparison. Even more unfortunately, this is biting us on every single kernel build with a new gas, because arch/arm/boot/compressed/head.S and some other files in that directory are built with -march=all since kernel commit 80cec14a8 "[ARM] Add -march=all to assembly file build in arch/arm/boot/compressed" back in v2.6.28. This patch reverts Russell's nice solution and instead marks the head.S file to be built for armv7-a, which fortunately lets us build all instructions in that file without warnings even on the broken binutils. Without this patch, building anything results in: arch/arm/boot/compressed/head.S: Assembler messages: arch/arm/boot/compressed/head.S:565: Warning: (null) arch/arm/boot/compressed/head.S:676: Warning: (null) arch/arm/boot/compressed/head.S:698: Warning: (null) arch/arm/boot/compressed/head.S:722: Warning: (null) arch/arm/boot/compressed/head.S:726: Warning: (null) arch/arm/boot/compressed/head.S:957: Warning: (null) arch/arm/boot/compressed/head.S:996: Warning: (null) arch/arm/boot/compressed/head.S:997: Warning: (null) arch/arm/boot/compressed/head.S:1027: Warning: (null) arch/arm/boot/compressed/head.S:1035: Warning: (null) arch/arm/boot/compressed/head.S:1046: Warning: (null) arch/arm/boot/compressed/head.S:1060: Warning: (null) arch/arm/boot/compressed/head.S:1092: Warning: (null) arch/arm/boot/compressed/head.S:1094: Warning: (null) arch/arm/boot/compressed/head.S:1095: Warning: (null) arch/arm/boot/compressed/head.S:1102: Warning: (null) arch/arm/boot/compressed/head.S:1134: Warning: (null) Signed-off-by: Arnd Bergmann Cc: Matthew Gretton-Dann Signed-off-by: Russell King [bwh: Backported to 3.2: - Adjust context - Remove definition of asflags-y as it is now empty] Signed-off-by: Ben Hutchings Cc: Yang Yingliang Signed-off-by: Greg Kroah-Hartman --- arch/arm/boot/compressed/Makefile | 1 - arch/arm/boot/compressed/head-sa1100.S | 1 + arch/arm/boot/compressed/head-shark.S | 1 + arch/arm/boot/compressed/head.S | 1 + 4 files changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index bb267562e7ed..0f7f3f42a1d5 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -126,7 +126,6 @@ KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) endif ccflags-y := -fpic -fno-builtin -I$(obj) -asflags-y := -Wa,-march=all # Supply kernel BSS size to the decompressor via a linker symbol. KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \ diff --git a/arch/arm/boot/compressed/head-sa1100.S b/arch/arm/boot/compressed/head-sa1100.S index 6179d94dd5c6..3115e313d9f6 100644 --- a/arch/arm/boot/compressed/head-sa1100.S +++ b/arch/arm/boot/compressed/head-sa1100.S @@ -11,6 +11,7 @@ #include .section ".start", "ax" + .arch armv4 __SA1100_start: diff --git a/arch/arm/boot/compressed/head-shark.S b/arch/arm/boot/compressed/head-shark.S index 089c560e07f1..92b56897ed64 100644 --- a/arch/arm/boot/compressed/head-shark.S +++ b/arch/arm/boot/compressed/head-shark.S @@ -18,6 +18,7 @@ .section ".start", "ax" + .arch armv4 b __beginning __ofw_data: .long 0 @ the number of memory blocks diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 87278fc80d9f..2b844dad5e93 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -10,6 +10,7 @@ */ #include + .arch armv7-a /* * Debugging stuff * -- cgit v1.2.3