From patchwork Thu Nov 22 04:47:28 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3.5.yuz, extended, stable] Patch "arch/tile: avoid generating .eh_frame information in modules" has been added to staging queue Date: Wed, 21 Nov 2012 18:47:28 -0000 From: Herton Ronaldo Krzesinski X-Patchwork-Id: 200966 Message-Id: <1353559648-1134-1-git-send-email-herton.krzesinski@canonical.com> To: Chris Metcalf Cc: kernel-team@lists.ubuntu.com This is a note to let you know that I have just added a patch titled arch/tile: avoid generating .eh_frame information in modules to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.yuz tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ >From 7d97779b24d73247d5f21932a8b2b151949d8236 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Fri, 19 Oct 2012 11:43:11 -0400 Subject: [PATCH] arch/tile: avoid generating .eh_frame information in modules 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 Signed-off-by: Herton Ronaldo Krzesinski --- arch/tile/Makefile | 4 ++++ 1 file changed, 4 insertions(+) -- 1.7.9.5 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