Messages in this thread Patch in this message | | | Date | Sun, 28 Oct 2012 23:16:44 +0000 | From | Ben Hutchings <> | Subject | [ 068/105] arch/tile: avoid generating .eh_frame information in modules |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Chris Metcalf <cmetcalf@tilera.com>
commit 627072b06c362bbe7dc256f618aaa63351f0cfe6 upstream.
The tile tool chain uses the .eh_frame information for backtracing. The vmlinux build drops any .eh_frame sections at link time, but when present in kernel modules, it causes a module load failure due to the presence of unsupported pc-relative relocations. When compiling to use compiler feedback support, the compiler by default omits .eh_frame information, so we don't see this problem. But when not using feedback, we need to explicitly suppress the .eh_frame.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- arch/tile/Makefile | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/tile/Makefile b/arch/tile/Makefile index 55640cf..3d15364 100644 --- a/arch/tile/Makefile +++ b/arch/tile/Makefile @@ -26,6 +26,10 @@ $(error Set TILERA_ROOT or CROSS_COMPILE when building $(ARCH) on $(HOST_ARCH)) endif endif +# The tile compiler may emit .eh_frame information for backtracing. +# In kernel modules, this causes load failures due to unsupported relocations. +KBUILD_CFLAGS += -fno-asynchronous-unwind-tables + ifneq ($(CONFIG_DEBUG_EXTRA_FLAGS),"") KBUILD_CFLAGS += $(CONFIG_DEBUG_EXTRA_FLAGS) endif
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