linux-kernel - Re: [PATCH 4/6] arm64: errata: Calling enable functions for CPU errata too

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160624153423.GF22608@e104818-lin.cambridge.arm.com>
Date:	Fri, 24 Jun 2016 16:34:24 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Andre Przywara <andre.przywara@....com>
Cc:	Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/6] arm64: errata: Calling enable functions for CPU
 errata too

On Mon, May 09, 2016 at 05:49:48PM +0100, Andre Przywara wrote:
> Currently we call the (optional) enable function for CPU _features_
> only. As CPU _errata_ descriptions share the same data structure and
> having an enable function is useful for errata as well (for instance
> to set bits in SCTLR), lets call it when enumerating erratas too.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  arch/arm64/include/asm/cpufeature.h | 2 ++
>  arch/arm64/kernel/cpu_errata.c      | 5 +++++
>  arch/arm64/kernel/cpufeature.c      | 4 ++--
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
> index b9b6494..cb8fb2c 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -174,7 +174,9 @@ void __init setup_cpu_features(void);
>  
>  void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
>  			    const char *info);
> +void enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps);
>  void check_local_cpu_errata(void);
> +void __init enable_cpu_errata(void);

Nitpick: I would rather call this enable_errata_workarounds since errata
are already enabled by in hardware ;).

-- 
Catalin