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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-28 23:34:23 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-28 23:34:23 +0100 |
| commit | 6aab341e0a28aff100a09831c5300a2994b8b986 (patch) | |
| tree | 1af3908275aa5e1b16e80efee554a9a7504c56d4 /drivers/char/mem.c | |
| parent | [PATCH] drivers/scsi/dpt_i2o.c: fix a NULL pointer dereference (diff) | |
| download | linux-6aab341e0a28aff100a09831c5300a2994b8b986.tar.xz 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.c | 2 |
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) |