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    Subject[PATCH 211/270] arch/tile: avoid generating .eh_frame information in modules
    Date
    3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.

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

    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: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    ---
    arch/tile/Makefile | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/arch/tile/Makefile b/arch/tile/Makefile
    index e20b0a0..7da1015 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
    --
    1.7.9.5


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