linux-kernel - Re: [PATCH] x86: fix ioport unification on 32-bit [was: Re: hwclock failure in x86.git]

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Date:	Mon, 14 Jan 2008 09:27:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	Kevin Winchester <kjwinchester@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"mboton@...il.com" <mboton@...il.com>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [PATCH] x86: fix ioport unification on 32-bit [was: Re:
	hwclock failure in x86.git]


* Chris Wright <chrisw@...s-sol.org> wrote:

> * Ingo Molnar (mingo@...e.hu) wrote:
> > thanks for tracking it down. I pulled that commit for now. But it would 
> > be nice to figure out what's going on there.
> 
> Zach was right. The unification was broken for 32-bit; it was missing 
> the actual pushf/popf EFLAGS manipluation (set_iopl_mask()) and 
> would've broken task switching between processes w/ different iopl in 
> paravirt guests too.  64-bit sys_iopl just does pt_regs->flags 
> modification and lets syscall/sysret plus ptregscall sync and do 
> EFLAGS update.
> 
> Also, use of volatile looks like leftover cruft.
> 
> This patch in on top of Miguel's (can respin to standalone if that's 
> better). [...]

thanks, applied.

	Ingo
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