linux-kernel - Re: [PATCH 09/32] x86/boot/e820: Call the PCI gap a 'gap' in the boot log printout

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Message-ID: <aDtFy1Fw5HUZtfcc@gmail.com>
Date: Sat, 31 May 2025 20:09:15 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Andy Shevchenko <andy@...nel.org>
Cc: linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Juergen Gross <jgross@...e.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Rapoport <rppt@...nel.org>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH 09/32] x86/boot/e820: Call the PCI gap a 'gap' in the
 boot log printout


* Andy Shevchenko <andy@...nel.org> wrote:

> On Thu, May 15, 2025 at 02:05:25PM +0200, Ingo Molnar wrote:
> > It is a bit weird and inconsistent that the PCI gap is
> > advertised during bootup as 'mem'ory:
> > 
> >   [mem 0xc0000000-0xfed1bfff] available for PCI devices
> >    ^^^
> > 
> > It's not really memory, it's a gap that PCI devices can decode
> > and use and they often do not map it to any memory themselves.
> > 
> > So advertise it for what it is, a gap:
> > 
> >   [gap 0xc0000000-0xfed1bfff] available for PCI devices
> 
> Why not use word 'range' instead of the 'gap'? This will allow to switch to
> %pra without modifying the output.

Well, it's not a range, it's a gap in the memory map. Why does %pra 
dictate details of the output in such a fashion?

Thanks,

	Ingo