linux-kernel - Re: [PATCH v5 0/6] Move swapper_pg

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Date:   Tue, 25 Sep 2018 17:53:16 +0800
From:   Jun Yao <yaojun8558363@...il.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        will.deacon@....com, james.morse@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/6] Move swapper_pg_dir to rodata section.

Hi Mark,

On Mon, Sep 24, 2018 at 06:19:36PM +0100, Mark Rutland wrote:
> Hi,
> 
> On Mon, Sep 17, 2018 at 12:43:27PM +0800, Jun Yao wrote:
> > Version 5 changes:
> > 	1. Correct spelling and indentation errors[1].
> > 	2. Update init_mm.pgd by assembly[2].
> > 	3. Simplify set_p?d() by introducing set_swapper_pgd()[3].
> > 	4. Reduce unnecessary tlbi for every write to swapper_pg_dir
> > 	   during paging_init()[3].
> > 
> > v4: https://www.spinics.net/lists/arm-kernel/msg672195.html
> > v3: https://www.spinics.net/lists/arm-kernel/msg662537.html
> > v2: https://patchwork.kernel.org/patch/10485641/
> > v1: https://patchwork.kernel.org/patch/10476595/
> > 
> > [1] https://www.spinics.net/lists/arm-kernel/msg675189.html
> > [2] https://www.spinics.net/lists/arm-kernel/msg675193.html
> > [3] https://www.spinics.net/lists/arm-kernel/msg675196.html
> > 
> > Jun Yao (6):
> >   arm64/mm: Introduce the init_pg_dir.
> >   arm64/mm: Pass ttbr1 as a parameter to __enable_mmu().
> >   arm64/mm: Create the initial page table in the init_pg_dir.
> >   arm64/mm: Create the final page table directly in swapper_pg_dir.
> >   arm64/mm: Populate the swapper_pg_dir by fixmap.
> >   arm64/mm: Move {idmap_pg_dir .. swapper_pg_dir} to rodata section.
> > 
> >  arch/arm64/include/asm/assembler.h | 29 ++++++++++++++++++
> >  arch/arm64/include/asm/pgtable.h   | 36 ++++++++++++++++++----
> >  arch/arm64/kernel/asm-offsets.c    |  1 +
> >  arch/arm64/kernel/head.S           | 48 ++++++++++++++++++++----------
> >  arch/arm64/kernel/sleep.S          |  1 +
> >  arch/arm64/kernel/vmlinux.lds.S    | 47 +++++++++++++++++++----------
> >  arch/arm64/mm/mmu.c                | 45 +++++++++++++---------------
> >  7 files changed, 147 insertions(+), 60 deletions(-)
> 
> I've pushed a branch with the cleanups I requested [1] folded in.
> 
> I'm still a bit worried about the pgd lock, but otherwise I think this
> is sound. I intend to throw some testing at it, just in case.
> 
> If you're happy with that branch, I'll ask Will and Catalin to consider
> picking it up.

This branch looks great. Thank you for improving my patch.

Is there anything I need to do? This is my first time to submit a patch,
so I am a bit overwhelmed. I think I should wait for other people to
review my patch. If there is a problem, I need to fix it.

Thanks,

Jun