linux-kernel - [PATCH 4.2.y-ckt 41/64] arm64: errata: Add -mpc-relative-literal-loads to build flags

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Message-Id: <1454625887-18915-42-git-send-email-kamal@canonical.com>
Date:	Thu,  4 Feb 2016 14:44:24 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dann Frazier <dann.frazier@...onical.com>,
	Will Deacon <will.deacon@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 41/64] arm64: errata: Add -mpc-relative-literal-loads to build flags

4.2.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: dann frazier <dann.frazier@...onical.com>

commit 67dfa1751ce71e629aad7c438e1678ad41054677 upstream.

GCC6 (and Linaro's 2015.12 snapshot of GCC5) has a new default that uses
adrp/ldr or adrp/add to address literal pools. When CONFIG_ARM64_ERRATUM_843419
is enabled, modules built with this toolchain fail to load:

  module libahci: unsupported RELA relocation: 275

This patch fixes the problem by passing '-mpc-relative-literal-loads'
to the compiler.

Fixes: df057cc7b4fa ("arm64: errata: add module build workaround for erratum #843419")
BugLink: http://bugs.launchpad.net/bugs/1533009
Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Suggested-by: Christophe Lyon <christophe.lyon@...aro.org>
Signed-off-by: Dann Frazier <dann.frazier@...onical.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm64/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 3258174..d7e808f 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -18,6 +18,7 @@ GZFLAGS		:=-9
 KBUILD_DEFCONFIG := defconfig
 
 KBUILD_CFLAGS	+= -mgeneral-regs-only
+KBUILD_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS	+= -mbig-endian
 AS		+= -EB
-- 
1.9.1