linux-kernel - [PATCH 4.4 050/342] arm64: errata: Add -mpc-relative-literal-loads to build flags

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Date:	Tue, 01 Mar 2016 23:54:00 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Christophe Lyon <christophe.lyon@...aro.org>,
	Dann Frazier <dann.frazier@...onical.com>,
	Will Deacon <will.deacon@....com>
Subject: [PATCH 4.4 050/342] arm64: errata: Add -mpc-relative-literal-loads to build flags

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

------------------

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.

Cc: stable@...r.kernel.org
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>
[will: backport to 4.4-stable]
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/Makefile |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -27,6 +27,7 @@ $(warning LSE atomics not supported by b
 endif
 
 KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr)
+KBUILD_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
 KBUILD_AFLAGS	+= $(lseinstr)
 
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)