From: dann.frazier@canonical.com (dann frazier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3] arm64: errata: Add -mpc-relative-literal-loads to build flags
Date: Tue, 26 Jan 2016 13:11:24 -0700 [thread overview]
Message-ID: <20160126201124.GA5614@fluid.dannf> (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
v2: Unconditionally use flag for both kernel and modules, as Ard notes we have
no requirement for supporting literals >1 MB away.
v3: Drop reference to -mfix-cortex-a53-843419.
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>
Acked-by: Ard Biesheuvel <ard.biesheuvel@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..b6c90e5 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -27,6 +27,7 @@ $(warning LSE atomics not supported by binutils)
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)
--
2.7.0
reply other threads:[~2016-01-26 20:11 UTC|newest]
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