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arch/tile: avoid generating .eh_frame information in modules

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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>
Cc: stable@vger.kernel.org
This commit is contained in:
Chris Metcalf 2012-10-19 11:43:11 -04:00
parent 6f0c0580b7
commit 627072b06c
1 changed files with 4 additions and 0 deletions
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arch/tile/Makefile
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@ -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