From: Steven Rostedt <rostedt@goodmis.org>
Date: Thu, 7 Jun 2007 03:34:04 +0000 (-0400)
Subject: enable interrupts in user path of page fault.
X-Git-Tag: v2.6.22-rc5~96
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5e3c84b70e58fc605635fd340fb8dba3cc59058;p=pandora-kernel.git

enable interrupts in user path of page fault.

This is a minor fix, but what is currently there is essentially wrong.
In do_page_fault, if the faulting address from user code happens to be
in kernel address space (int *p = (int*)-1; p = 0xbed;)  then the
do_page_fault handler will jump over the local_irq_enable with the

  goto bad_area_nosemaphore;

But the first line there sees this is user code and goes through the
process of sending a signal to send SIGSEGV to the user task. This whole
time interrupts are disabled and the task can not be preempted by a
higher priority task.

This patch always enables interrupts in the user path of the
bad_area_nosemaphore.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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