linux-kernel - Re: [PATCH v2] sh: Call paging_init() earlier in the init sequence

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Message-ID: <0e813c8498bf3d9ed5d8fd5b171ac9980dc2999c.camel@physik.fu-berlin.de>
Date: Wed, 08 May 2024 00:41:45 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>, 
	ysato@...rs.sourceforge.jp, dalias@...c.org
Cc: akpm@...ux-foundation.org, linux-sh@...r.kernel.org, 
 linux-kernel@...r.kernel.org, robh+dt@...nel.org, kernel@...cinc.com, Rob
 Herring <robh@...nel.org>, Rob Landley <rob@...dley.net>
Subject: Re: [PATCH v2] sh: Call paging_init() earlier in the init sequence

Hello Oreoluwa,

On Tue, 2024-05-07 at 14:42 -0700, Oreoluwa Babatunde wrote:
> memblock_alloc() marks all its allocations as reserved by calling
> memblock_reserve().
> https://elixir.bootlin.com/linux/latest/source/mm/memblock.c#L1463
> 
> This should normally stop other users from allocating from within that
> region of memory.
> 
> But in this case, since all the free memory regions have already been
> transferred over to the bootmem framework by paging_init(), I am not
> sure if that logic will still hold for the unflatten_deivcetree allocated memory.
> 
> The main goal of this patch is to make sure that the reserved memory
> regions defined in the DT are set aside before any memblock allocations
> are done (which includes the allocation done by unflatten_devicetree).
> 
> Hence, I can restructure the patch to only remove the portion of code that is
> is responsible for setting aside the DT defined reserved memory regions from
> within paging_init(), and move it above the unflatten_devicetree() call.
> https://elixir.bootlin.com/linux/latest/source/arch/sh/mm/init.c#L292
> 
> I will explore further and possibly restructure this patch based on my findings.

OK, sounds like a plan. In the meantime, I have set up my J2 Turtle Board and
I am actually now able to test patches for this target, so that I would be
able to verify that your patch didn't break anything.

However, I think for v6.10 I think the ship has sailed.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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