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parisc: fix find_extend_vma() breakage

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The STACK_GROWSUP case of stack expansion was missing a test for 'prev',
which got removed by commit cb8f488c33
("mmap.c: deinline a few functions") by mistake.

I found my original email in "sent" folder. The patch in that mail
does NOT remove !prev. That change had beed added by someone else.

Ok, I think we are not much interested in who did it, let's
fix it for good.

[ "It looks like this was caused by me fixing rejects.  That was the
  fancy include-lots-of-context-so-it-wont-apply patch." - akpm ]

Reported-and-bisected-by: Helge Deller <[email protected]>
Signed-off-by: Denys Vlasenko <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Jiri Kosina <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Denys Vlasenko 2008-11-12 01:24:41 +01:00 • committed by Linus Torvalds
commit 1c12718504
1 changed files with 1 additions and 1 deletions
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2
mm/mmap.c
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@ -1704,7 +1704,7 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
vma = find_vma_prev(mm, addr, &prev);
if (vma && (vma->vm_start <= addr))
return vma;
if (expand_stack(prev, addr))
if (!prev || expand_stack(prev, addr))
return NULL;
if (prev->vm_flags & VM_LOCKED) {
if (mlock_vma_pages_range(prev, addr, prev->vm_end) < 0)