From: Yury Norov <ynorov@caviumnetworks.com>
To: <mark.rutland@arm.com>, <Suzuki.Poulose@arm.com>,
<Catalin.Marinas@arm.com>
Cc: <klimov.linux@gmail.com>, <ddaney.cavm@gmail.com>,
<ard.biesheuvel@linaro.org>, <will.deacon@arm.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <yury.norov@gmail.com>,
Yury Norov <ynorov@caviumnetworks.com>
Subject: [PATCH v2 0/2] arm64: introduce run-time detection of aarch32 support
Date: Wed, 2 Sep 2015 17:00:36 +0300 [thread overview]
Message-ID: <1441202438-27005-1-git-send-email-ynorov@caviumnetworks.com> (raw)
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.
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 <ynorov@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
next reply other threads:[~2015-09-02 14:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-02 14:00 Yury Norov [this message]
2015-09-02 14:00 ` [PATCH v2 1/2] arm64: cpufeature.h: resolve hidden header dependencies Yury Norov
2015-09-02 14:23 ` Mark Rutland
2015-09-02 14:00 ` [PATCH v2 2/2] arm64: don't load 32-bit binaries if platform has no aarch32_el0 Yury Norov
2015-09-02 14:15 ` Ard Biesheuvel
2015-09-02 14:38 ` Yury Norov
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