linux-kernel - Re: [patch 29/29] initrd: Fix virtual/physical mix-up in overwrite test

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Message-Id: <20080726.012731.122621958.anemo@mba.ocn.ne.jp>
Date:	Sat, 26 Jul 2008 01:27:31 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	geert@...ux-m68k.org
Cc:	ralf@...ux-mips.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-m68k@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-arch@...r.kernel.org
Subject: Re: [patch 29/29] initrd: Fix virtual/physical mix-up in overwrite
 test

On Thu, 24 Jul 2008 20:49:27 +0200 (CEST), Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > Because an argument of mips virt_to_phys() is an pointer and
> > initrd_start is unsigned long.  It seems most (all?) arch's
> > virt_to_phys() casts its argument to unsigned long internally.  Should
> > mips follow?
> 
> Alternatively, as initrd_start is really a virtual kernel address,
> perhaps it should be changed from unsigned long to void * instead?
> 
> It's cast to `void *' in several place. arch/xtensa/kernel/setup.c even
> has `extern void *initrd_start' to fool around this?

I agree it would make code cleaner, but the conversion might be
somewhat hard.

If we converted initrd_start (and initrd_end) to void *, we should
also convert INITRD_START, free_initrd_mem(), some other arch specific
local/global variables and printk format strings.  Also code like
"initrd_start & PAGE_MASK" should be changed too...

Is it worth to do?

---
Atsushi Nemoto
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