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get_user_pages: don't try to follow PFNMAP pages

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Nick Piggin points out that a few drivers play games with VM_IO (why?
who knows..) and thus a pfn-remapped area may not have that bit set even
if remap_pfn_range() set it originally.

So make it explicit in get_user_pages() that we don't follow VM_PFNMAP
pages, since pretty much by definition they do not have a "struct page"
associated with them.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-12-12 16:24:33 -08:00
parent 14ee0a1414
commit 1ff8038988
1 changed files with 1 additions and 1 deletions
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2
mm/memory.c
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@ -1009,7 +1009,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
continue;
}
if (!vma || (vma->vm_flags & VM_IO)
if (!vma || (vma->vm_flags & (VM_IO | VM_PFNMAP))
|| !(vm_flags & vma->vm_flags))
return i ? : -EFAULT;