* [PPC64] Bug fix for hugepages on ppc64
@ 2004-01-20 6:21 David Gibson
0 siblings, 0 replies; only message in thread
From: David Gibson @ 2004-01-20 6:21 UTC (permalink / raw)
To: Andrew Morton; +Cc: Anton Blanchard, linuxppc64-dev, linux-kernel
Andrew, please apply.
Currently the flag indicating whether or not hugepages are allowed
below 4GB is not correctly propagated across fork(), which can lead to
oopses. The patch below fixes this.
diff -urN ppc64-linux-2.5/include/asm-ppc64/mmu_context.h linux-gogogo/include/asm-ppc64/mmu_context.h
--- ppc64-linux-2.5/include/asm-ppc64/mmu_context.h 2003-12-18 09:29:18.000000000 +1100
+++ linux-gogogo/include/asm-ppc64/mmu_context.h 2004-01-19 15:36:43.518987021 +1100
@@ -81,6 +81,8 @@
{
long head;
unsigned long flags;
+ /* This does the right thing across a fork (I hope) */
+ unsigned long low_hpages = mm->context & CONTEXT_LOW_HPAGES;
spin_lock_irqsave(&mmu_context_queue.lock, flags);
@@ -91,6 +93,7 @@
head = mmu_context_queue.head;
mm->context = mmu_context_queue.elements[head];
+ mm->context |= low_hpages;
head = (head < LAST_USER_CONTEXT-1) ? head+1 : 0;
mmu_context_queue.head = head;
--
David Gibson | For every complex problem there is a
david AT gibson.dropbear.id.au | solution which is simple, neat and
| wrong.
http://www.ozlabs.org/people/dgibson
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2004-01-20 6:21 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-01-20 6:21 [PPC64] Bug fix for hugepages on ppc64 David Gibson
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox