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authorLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:34:23 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:34:23 -0800
commit6aab341e0a28aff100a09831c5300a2994b8b986 (patch)
tree1af3908275aa5e1b16e80efee554a9a7504c56d4 /drivers/char/mem.c
parent458af5439fe7ae7d95ca14106844e61f0795166c (diff)
downloadblackbird-op-linux-6aab341e0a28aff100a09831c5300a2994b8b986.tar.gz
blackbird-op-linux-6aab341e0a28aff100a09831c5300a2994b8b986.zip
mm: re-architect the VM_UNPAGED logic
This replaces the (in my opinion horrible) VM_UNMAPPED logic with very explicit support for a "remapped page range" aka VM_PFNMAP. It allows a VM area to contain an arbitrary range of page table entries that the VM never touches, and never considers to be normal pages. Any user of "remap_pfn_range()" automatically gets this new functionality, and doesn't even have to mark the pages reserved or indeed mark them any other way. It just works. As a side effect, doing mmap() on /dev/mem works for arbitrary ranges. Sparc update from David in the next commit. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 29c3b631445a..91dd669273e0 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -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 | VM_UNPAGED))
+ if (vma->vm_flags & (VM_SHARED | VM_HUGETLB))
break;
count = vma->vm_end - addr;
if (count > size)
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