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[PATCH] unpaged: ZERO_PAGE in VM_UNPAGED

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It's strange enough to be looking out for anonymous pages in VM_UNPAGED areas,
let's not insert the ZERO_PAGE there - though whether it would matter will
depend on what we decide about ZERO_PAGE refcounting.

But whereas do_anonymous_page may (exceptionally) be called on a VM_UNPAGED
area, do_no_page should never be: just BUG_ON.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-11-21 21:32:19 -08:00
committed by Linus Torvalds
parent ee498ed730
commit f57e88a8d8
2 changed files with 13 additions and 3 deletions
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2
drivers/char/mem.c
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@ -591,7 +591,7 @@ static inline size_t read_zero_pagealigned(char __user * buf, size_t size)
if (vma->vm_start > addr || (vma->vm_flags & VM_WRITE) == 0)
goto out_up;
if (vma->vm_flags & (VM_SHARED | VM_HUGETLB))
if (vma->vm_flags & (VM_SHARED | VM_HUGETLB | VM_UNPAGED))
break;
count = vma->vm_end - addr;
if (count > size)