linux-kernel - Re: [PATCH v2 0/4] ARM: v7-A !MMU support, prepare CONFIG_VECTORS

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Message-ID: <e2f26415-61ef-7b2c-6ca5-cf06182e9cfd@arm.com>
Date:   Wed, 25 Jan 2017 11:24:05 +0000
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] ARM: v7-A !MMU support, prepare
 CONFIG_VECTORS_BASE removal

On 22/01/17 03:16, afzal mohammed wrote:
> Hi,
> 
> ARM core changes to support !MMU Kernel on v7-A MMU processors. This
> series also does the preparation for CONFIG_VECTORS_BASE removal.
> 
> Based on the feedback from Russell, it was decided to handle vector
> base dynamically in C for no-MMU & work towards the the goal of
> removing VECTORS_BASE from Kconfig. MMU platform's always have
> exception base address at 0xffff0000, hence a macro was defined and
> it was decoupled from Kconfig. No-MMU CP15 scenario is handled
> dynamically in C. Once vector region setup, used by Cortex-R, is
> made devoid of VECTORS_BASE, it can be removed from Kconfig.
> 
> This series has been verified over current mainline plus [2] on
> Vybrid Cosmic+, Cortex-M4 - !MMU Kernel and Cortex-A5 - MMU Kernel.
> 
> This series also has been verified over Vladimir's series plus [2] on
> 1. Vybrid Cosmic+
>  a. Cortex-M4 !MMU Kernel
>  b. Cortex-A5 MMU Kernel
>  c. Cortex-A5 !MMU Kernel
> 2. AM437x IDK
>  a. Cortex-A9 MMU Kernel
>  b. Cortex-A9 !MMU Kernel
> 
> Regards
> afzal
> 

It did not break my R-class setup and M-class MPS2 works too, so FWIW:

Tested-by: Vladimir Murzin <vladimir.murzin@....com>

Cheers
Vladimir

> 
> v2:
> => Fix bisectability issue on !MMU builds
> => UL suffix on VECTORS_BASE definition
> => Use existing helpers to detect security extensions
> => Rewrite a CPP step to C for readability
> 
> [1] "[RFC v2 PATCH 00/23] Allow NOMMU for MULTIPLATFORM",
>     http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/470966.html
>     (git://linux-arm.org/linux-vm.git nommu-rfc-v2)
> 
> [2] "[PATCH 1/2] ARM: nommu: allow enabling REMAP_VECTORS_TO_RAM"
>     http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473593.html
>     (in -next)
> 
> afzal mohammed (4):
>   ARM: mmu: decouple VECTORS_BASE from Kconfig
>   ARM: nommu: dynamic exception base address setting
>   ARM: nommu: display vectors base
>   ARM: nommu: remove Hivecs configuration is asm
> 
>  arch/arm/include/asm/memory.h  |  2 ++
>  arch/arm/kernel/head-nommu.S   |  5 ----
>  arch/arm/mach-berlin/platsmp.c |  3 ++-
>  arch/arm/mm/dump.c             |  5 ++--
>  arch/arm/mm/init.c             |  9 ++++++--
>  arch/arm/mm/mm.h               |  5 ++--
>  arch/arm/mm/nommu.c            | 52 ++++++++++++++++++++++++++++++++++++++++--
>  7 files changed, 67 insertions(+), 14 deletions(-)
>