From: dann.frazier@canonical.com (dann frazier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: errata: Add -mpc-relative-literal-loads to erratum #843419 build flags
Date: Fri, 22 Jan 2016 16:07:02 -0700 [thread overview]
Message-ID: <1453504022-7890-1-git-send-email-dann.frazier@canonical.com> (raw)
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:
[ 2.156817] module libahci: unsupported RELA relocation: 275
Longterm, this will likely be superseded by -mfix-cortex-a53-843419, which
should disable this optimization in the future.
Cc: stable at vger.kernel.org
Fixes: df057cc7b4fa ("arm64: errata: add module build workaround for erratum #843419")
BugLink: http://bugs.launchpad.net/bugs/1533009
Suggested-by: Christophe Lyon <christophe.lyon@linaro.org>
Signed-off-by: dann frazier <dann.frazier@canonical.com>
---
arch/arm64/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index cd822d8..08e794d 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -43,6 +43,7 @@ CHECKFLAGS += -D__aarch64__
ifeq ($(CONFIG_ARM64_ERRATUM_843419), y)
KBUILD_CFLAGS_MODULE += -mcmodel=large
+KBUILD_CFLAGS_MODULE += $(call cc-option, -mpc-relative-literal-loads)
endif
# Default value
--
2.7.0
next reply other threads:[~2016-01-22 23:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-22 23:07 dann frazier [this message]
2016-01-25 7:17 ` [PATCH] arm64: errata: Add -mpc-relative-literal-loads to erratum #843419 build flags Ard Biesheuvel
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