linux-kernel - Re: [PATCH][RFC] jump_labels/x86: Use either 5 byte or 2 byte jumps

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Message-ID: <1318015989.4729.72.camel@gandalf.stny.rr.com>
Date:	Fri, 07 Oct 2011 15:33:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Richard Henderson <rth@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>,
	David Daney <david.daney@...ium.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Jan Glauber <jang@...ux.vnet.ibm.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	peterz@...radead.org
Subject: Re: [PATCH][RFC] jump_labels/x86: Use either 5 byte or 2 byte jumps

On Fri, 2011-10-07 at 15:21 -0400, Steven Rostedt wrote:

> > > +	/*
> > > +	 * This is specific to x86. The jump_table is stored in three
> > > +	 * long words. The first is the location of the jmp target we
> > > +	 * must update.
> > > +	 */
> > > +	cnt = size / sizeof(uint_t);
> > > +
> > > +	for (i = 0; i < cnt; i += 3)
> > > +		if (0)make_nop((void *)ehdr, *(uint_t *)(data + i * sizeof(uint_t)));

I just compiled and booted the 

-		if (0)make_nop((void *)ehdr, *(uint_t *)(data + i * sizeof(uint_t)));
+		make_nop((void *)ehdr, *(uint_t *)(data + i * sizeof(uint_t)));

version, and it still works.

Phew!

-- Steve


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