linux-kernel - Re: [PATCH -v3 1/4] pci, usb: Make usb handoff func all take base remapping

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Date:	Tue, 11 Jan 2011 18:37:47 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Greg KH <greg@...ah.com>, Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v3 1/4] pci, usb:  Make usb handoff func all take base
 remapping

On Mon, 2011-01-10 at 22:34 -0800, Yinghai Lu wrote:
> 
> system_state does not work.
> it only have BOOTING and RUNNING ...
> RUNNING is set in init/main.c::init_post().
> so early_quirk and pci_quirk all with BOOTING stage...

Or we can make msleep() itself safe...

Ben.

>  slab_is_available() could be used, but looks alike abuse.
> 
> > 
> > We could even wrap it into a safe_delay() function or whatever (in
> fact
> > why not make msleep() itself safe ? It's not like it was timing
> critical
> > code :-)
> 
> like 
> void safe_udelay(unsigned long usecs)
> {
>         if (slab_is_available())
>                 udelay(usecs)
>         else
>                 early_udelay(usecs);
> }
> 
> or wonder if you are happy with
> 
> void __weak safe_udelay(unsigned long usecs)
> {
>         udelay(usecs);
> }
> 
> and will have x86 have it's own safe_udelay... 

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