From: David Mosberger-Tang <davidm@hpl.hp.com>
Date: Wed, 4 May 2005 20:25:00 +0000 (-0700)
Subject: [IA64] Speed up lfetch.fault [NULL]
X-Git-Tag: v2.6.13-rc2~59^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=458f935527372499b714bf4f8e646a68bb0f52e3;p=pandora-kernel.git

[IA64] Speed up lfetch.fault [NULL]

This patch greatly speeds up the handling of lfetch.fault instructions
which result in NaT consumption. Due to the NaT-page mapped at address
0, this is guaranteed to happen when lfetch.fault'ing a NULL pointer.
With this patch in place, we can even define prefetch()/prefetchw() as
lfetch.fault without significant performance degradation.  More
importantly, it allows compilers to be more aggressive with using
lfetch.fault on pointers that might be NULL.

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

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