* Luck, Tony <[EMAIL PROTECTED]> [2007-08-15 13:46:39 -0700]:
> But it looks on paper like this solves the RBS case.
>
> Needs a "Signed-off-by" line.
Apologies, this is my first kernel patch, so I'm still learning :)
Signed-off-by: Andrew Burgess <[EMAIL PROTECTED]>
diff -urp linux-2.6.18/arch/ia64/mm/fault.c linux-2.6.18/arch/ia64/mm/fault.c
--- linux-2.6.18/arch/ia64/mm/fault.c 2006-09-20 04:42:06.000000000 +0100
+++ linux-2.6.18/arch/ia64/mm/fault.c 2007-08-07 08:18:11.000000000 +0100
@@ -125,11 +125,17 @@ ia64_do_page_fault (unsigned long addres
down_read(&mm->mmap_sem);
vma = find_vma_prev(mm, address, &prev_vma);
- if (!vma)
+ if (!vma && !prev_vma )
goto bad_area;
- /* find_vma_prev() returns vma such that address < vma->vm_end or NULL
*/
- if (address < vma->vm_start)
+ /*
+ * find_vma_prev() returns vma such that address < vma->vm_end or NULL
+ *
+ * May find no vma, but could be that the last vm area is the
+ * register backing store that needs to expand upwards, in
+ * this case vma will be null, but prev_vma will ne non-null
+ */
+ if (( !vma && prev_vma ) || (address < vma->vm_start) )
goto check_expansion;
good_area:
@@ -184,6 +190,8 @@ ia64_do_page_fault (unsigned long addres
check_expansion:
if (!(prev_vma && (prev_vma->vm_flags & VM_GROWSUP) && (address ==
prev_vma->vm_end))) {
+ if (!vma)
+ goto bad_area;
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)
-
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