* Bugfix for PPC64 hugepage support
@ 2004-04-01 4:29 David Gibson
0 siblings, 0 replies; only message in thread
From: David Gibson @ 2004-04-01 4:29 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton; +Cc: linux-kernel, linuxppc64-dev
Linus, please apply.
Due to a misunderstanding of pmd_offset() the PPC64 hugepage code could
end up looking at bogus pages as if they were PMD pages.
Index: working-2.6/arch/ppc64/mm/hugetlbpage.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/hugetlbpage.c 2004-03-09 10:50:44.000000000 +1100
+++ working-2.6/arch/ppc64/mm/hugetlbpage.c 2004-04-01 12:53:54.920618632 +1000
@@ -190,6 +190,9 @@
BUG_ON(!in_hugepage_area(mm->context, addr));
pgd = pgd_offset(mm, addr);
+ if (pgd_none(*pgd))
+ return NULL;
+
pmd = pmd_offset(pgd, addr);
/* We shouldn't find a (normal) PTE page pointer here */
--
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:[~2004-04-01 4:32 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-04-01 4:29 Bugfix for PPC64 hugepage support David Gibson
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.