From: Kyle McMartin <kyle@infradead.org>
Date: Tue, 23 Dec 2008 13:44:30 +0000 (-0500)
Subject: parisc: disable UP-optimized flush_tlb_mm
X-Git-Tag: v2.6.27.11~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=398604a3a6b864d7a09c67772a7d44cf88ce24a0;p=pandora-kernel.git

parisc: disable UP-optimized flush_tlb_mm

commit 5289f46b9de04bde181d833d48df9671b69c4b08 upstream.

flush_tlb_mm's "optimized" uniprocessor case of allocating a new
context for userspace is exposing a race where we can suddely return
to a syscall with the protection id and space id out of sync, trapping
on the next userspace access.

Debugged-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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