This is needed to avoid loading aarch32 binaries if COMPAT is enabled, but aarch32 is not supported by specific platform.
First patch fixes hidden header dependencies in arch/arm64/include/asm/cpufeature.h. It's not related to the issue, but helps to avoid build failure that happens if one applies second patch only. Second patch adds run-time detection of aarch32 support, and rejects kernel to load such binaries, if not supported. Tested on ThunderX. V3: - first patch message extended with explanation for cpu_feature macro move; - in second patch, restored pfr0 masking in id_aa64pfr0_aarch32_el0(). V2: - add missing <linux/compiler.h> for the __attribute_const__ on cpuid_feature_extract_field; - move cpu_feature macro under the __ASSEMBLY__ guard. - check that all CPUs support AArch32, not the current only, the same way as for endianness support. Signed-off-by: Yury Norov <yno...@caviumnetworks.com> Yury Norov (2): arm64: cpufeature.h: resolve hidden header dependencies arm64: don't load 32-bit binaries if platform has no aarch32_el0 arch/arm64/include/asm/cpufeature.h | 10 +++++++++- arch/arm64/include/asm/cputype.h | 8 ++++++++ arch/arm64/include/asm/elf.h | 6 ++++-- arch/arm64/kernel/cpuinfo.c | 12 ++++++++++++ 4 files changed, 33 insertions(+), 3 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
