linux-kernel - Re: [PATCH 00/21] MIPS memblock: Remove bootmem code and switch to NO

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Date:   Mon, 23 Jan 2017 08:55:02 +0100
From:   Marcin Nowakowski <marcin.nowakowski@...tec.com>
To:     Serge Semin <fancer.lancer@...il.com>, <ralf@...ux-mips.org>,
        <paul.burton@...tec.com>, <rabinv@...s.com>,
        <matt.redfearn@...tec.com>, <james.hogan@...tec.com>,
        <alexander.sverdlin@...ia.com>, <robh+dt@...nel.org>,
        <frowand.list@...il.com>
CC:     <Sergey.Semin@...latforms.ru>, <linux-mips@...ux-mips.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/21] MIPS memblock: Remove bootmem code and switch to
 NO_BOOTMEM

Hi Serge,

Thanks for this patch series, it's really useful. I've tested it on 
Malta and Ci40 and it seems to work well (I've posted a few small 
comments separately).


On 19.12.2016 03:07, Serge Semin wrote:
> Most of the modern platforms supported by linux kernel have already
> been cleaned up of old bootmem allocator by moving to nobootmem
> interface wrapping up the memblock. This patchset is the first
> attempt to do the similar improvement for MIPS for UMA systems
> only.
>
> Even though the porting was performed as much careful as possible
> there still might be problem with support of some platforms,
> especially Loonson3 or SGI IP27, which perform early memory manager
> initialization by their self.

> The patchset is split so individual patch being consistent in
> functional and buildable ways. But the MIPS early memory manager
> will work correctly only either with or without the whole set being
> applied. For the same reason a reviewer should not pay much attention
> to methods bootmem_init(), arch_mem_init(), paging_init() and
> mem_init() until they are fully refactored.

I'm not sure this can be merged that way? It would be up to Ralf to 
decide, but it is generally expected that all intermediate patches not 
only build, but also work correctly. I understand that this might be 
difficult to achieve given the scale of changes required here.

> The patchset is applied on top of kernel v4.9.

Can you please work on cleaning up the issues discussed in the comments 
so far as well as rebasing (and updating) the changes onto linux-next? 
There are a few patches I made related to kexec and kernel relocation 
that will force changes in your code (although I admit that the changes 
I did for kexec/relocation were in some places unnecessarily complex 
because of the mess in the bootmem handling in MIPS that you are now 
trying to clean up).


Thanks,
Marcin

> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
>
> Serge Semin (21):
>   MIPS memblock: Unpin dts memblock sanity check method
>   MIPS memblock: Add dts mem and reserved-mem callbacks
>   MIPS memblock: Alter traditional add_memory_region() method
>   MIPS memblock: Alter user-defined memory parameter parser
>   MIPS memblock: Alter initrd memory reservation method
>   MIPS memblock: Alter kexec-crashkernel parameters parser
>   MIPS memblock: Alter elfcorehdr parameters parser
>   MIPS memblock: Move kernel parameters parser into individual method
>   MIPS memblock: Move kernel memory reservation to individual method
>   MIPS memblock: Discard bootmem allocator initialization
>   MIPS memblock: Add memblock sanity check method
>   MIPS memblock: Add memblock print outs in debug
>   MIPS memblock: Add memblock allocator initialization
>   MIPS memblock: Alter IO resources initialization method
>   MIPS memblock: Alter weakened MAAR initialization method
>   MIPS memblock: Alter paging initialization method
>   MIPS memblock: Alter high memory freeing method
>   MIPS memblock: Slightly improve buddy allocator init method
>   MIPS memblock: Add print out method of kernel virtual memory layout
>   MIPS memblock: Add free low memory test method call
>   MIPS memblock: Deactivate old bootmem allocator
>
>  arch/mips/Kconfig        |   2 +-
>  arch/mips/kernel/prom.c  |  32 +-
>  arch/mips/kernel/setup.c | 958 +++++++++++++++--------------
>  arch/mips/mm/init.c      | 234 ++++---
>  drivers/of/fdt.c         |  47 +-
>  include/linux/of_fdt.h   |   1 +
>  6 files changed, 739 insertions(+), 535 deletions(-)
>