From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Tue, 9 Feb 2016 17:36:06 +0000 Subject: [PATCH 6/6] arm64: compat: Check for AArch32 state In-Reply-To: <1453980737-6126-7-git-send-email-suzuki.poulose@arm.com> References: <1453980737-6126-1-git-send-email-suzuki.poulose@arm.com> <1453980737-6126-7-git-send-email-suzuki.poulose@arm.com> Message-ID: <20160209173606.GX22874@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Jan 28, 2016 at 11:32:17AM +0000, Suzuki K Poulose wrote: > Make sure we have AArch32 state available for running COMPAT binaries. > > Signed-off-by: Yury Norov > [ Added checks for ELF HWCAP, Use cap bit in cap_hwcaps ] > Signed-off-by: Suzuki K Poulose [...] > diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c > index 8cc2a86..2890b74 100644 > --- a/arch/arm64/kernel/cpuinfo.c > +++ b/arch/arm64/kernel/cpuinfo.c > @@ -124,7 +124,8 @@ static int c_show(struct seq_file *m, void *v) > * software which does already (at least for 32-bit). > */ > seq_puts(m, "Features\t:"); > - if (personality(current->personality) == PER_LINUX32) { > + if (system_supports_32bit_el0() && > + personality(current->personality) == PER_LINUX32) { Wouldn't it be better to prevent tasks changing to the PER_LINUX32 personality on systems that don't support AArch32 at EL0? Will