[PATCH 0/2] arm64: introduce run-time detection of aarch32 support

From: Yury Norov
Date: Tue Sep 01 2015 - 10:56:26 EST

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.

Signed-off-by: Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx>

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 | 6 ++++++
arch/arm64/include/asm/elf.h | 6 ++++--
arch/arm64/kernel/cpuinfo.c | 9 +++++++++
3 files changed, 19 insertions(+), 2 deletions(-)


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