linux-kernel - Re: [PATCH 1/3] mm: vmalloc: export __vmalloc_node

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Message-ID: <ZpkKwfESyr91ekco@freedom.csh.rit.edu>
Date: Thu, 18 Jul 2024 08:29:53 -0400
From: Mary Strodl <mstrodl@...edom.csh.rit.edu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mary Strodl <mstrodl@....rit.edu>, linux-kernel@...r.kernel.org,
	urezki@...il.com, hch@...radead.org, linux-mm@...ck.org,
	lee@...nel.org, andi.shyti@...nel.org, linux-i2c@...r.kernel.org,
	s.hauer@...gutronix.de, christian.gmeiner@...il.com
Subject: Re: [PATCH 1/3] mm: vmalloc: export __vmalloc_node_range

On Wed, Jul 17, 2024 at 07:53:23PM -0700, Andrew Morton wrote:
> Removed by which commit?

Thanks. This was removed in:
88dca4ca5a93 mm: remove the pgprot argument to __vmalloc

It was removed because every driver was passing PAGE_KERNEL

> Why does this driver need a thing which no other driver does?

You can	find more information in the manufacturer's docs:
https://www.congatec.com/fileadmin/user_upload/Documents/Manual/CGOSAPI.pdf

In particular, section 1 (page 11) describes how they intend for
it to work.

Basically, they	provide	an x86 blob in the BIOS	that we	copy
into kernelspace and mark executable. Then, we can call into that
blob to access congatec's special hardware.

Thanks again for reviewing my patches!

If there is a better way to do what I'm trying to do, please let
me know. It's possible I'm missing something obvious.