* Add useful warning message in PPC64 hugepage code
@ 2004-04-01 4:49 David Gibson
0 siblings, 0 replies; only message in thread
From: David Gibson @ 2004-04-01 4:49 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton; +Cc: linux-kernel, linuxppc64-dev
Linus, please apply:
This patch adds a debugging message to the ppc64 hugepage code when we
attempt to open the "low" (32-bit) hugepage window on PPC64, but can't
because a (non-hugepage) mapping already exists in the region.
Index: working-2.6/arch/ppc64/mm/hugetlbpage.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/hugetlbpage.c 2004-04-01 14:28:49.000000000 +1000
+++ working-2.6/arch/ppc64/mm/hugetlbpage.c 2004-04-01 14:32:30.430607144 +1000
@@ -253,8 +253,11 @@
/* Check no VMAs are in the region */
vma = find_vma(mm, TASK_HPAGE_BASE_32);
- if (vma && (vma->vm_start < TASK_HPAGE_END_32))
+ if (vma && (vma->vm_start < TASK_HPAGE_END_32)) {
+ printk(KERN_DEBUG "Low HTLB region busy: PID=%d vma @ %lx-%lx\n",
+ current->pid, vma->vm_start, vma->vm_end);
return -EBUSY;
+ }
/* Clean up any leftover PTE pages in the region */
spin_lock(&mm->page_table_lock);
--
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
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