From mboxrd@z Thu Jan 1 00:00:00 1970 From: dave.martin@linaro.org (Dave Martin) Date: Wed, 10 Aug 2011 11:13:38 +0100 Subject: [RFC PATCH 0/5] Fix Thumb-2 undef handling for mixed-arch kernels Message-ID: <1312971223-28165-1-git-send-email-dave.martin@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org In kernels which support v6 and v7 platforms in a single binary such as omap2plus_defconfig for example, undefined instruction exceptions taken on Thumb instructions are not processed correctly, because the kernel assumes at build-time that Thumb-2 won't be supported in userspace. This series implements a workaround, by allowing the __und_usr handler to check the CPU architecture at runtime, in affected kernels. As a side-effect, this also changes cpu_architecture from a function into a global variable initialised at boot-time, which is probably a sensible idea anyway. While I think the approach in this series is roughly correct, it's not very pretty -- in anyone was a cleaner solution to suggest, I'm open to ideas. Note that much of the actual diffstat comes from changing references to cpu_architecture(). Dave Martin (5): ARM: Make cpu_alignment into a global variable ARM: s3c24xx: Reference cpu_architecture as a global variable ARM: kprobes: Reference cpu_architecture as a global variable ARM: entry: Remove unnecessary masking when decoding Thumb-2 instructions ARM: entry: Fix Thumb-2 undef handling for multi-CPU kernels arch/arm/include/asm/system.h | 2 +- arch/arm/kernel/elf.c | 4 ++- arch/arm/kernel/entry-armv.S | 44 +++++++++++++++++++++++++++++++++---- arch/arm/kernel/kprobes-common.c | 11 ++++----- arch/arm/kernel/setup.c | 12 ++++++---- arch/arm/kernel/thumbee.c | 4 +- arch/arm/mm/alignment.c | 9 ++++--- arch/arm/mm/fault.c | 4 +- arch/arm/mm/idmap.c | 3 +- arch/arm/mm/ioremap.c | 3 +- arch/arm/mm/mmu.c | 31 ++++++++++++++------------ arch/arm/plat-s3c24xx/cpu.c | 3 +- arch/arm/vfp/vfpmodule.c | 4 +- 13 files changed, 89 insertions(+), 45 deletions(-) -- 1.7.4.1