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| author | Jeff Garzik <jgarzik@pobox.com> | 2005-08-14 23:10:00 -0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-08-14 23:10:00 -0400 |
| commit | 4c0e176dd5e4c44dd60f398518f75eedbe1a65f3 (patch) | |
| tree | 07aea7539f78f221c6fc535a94a07befa2afdb63 /drivers/char/mem.c | |
| parent | f241be74b803dcf9d70c9978292946370654320f (diff) | |
| parent | 2ba84684e8cf6f980e4e95a2300f53a505eb794e (diff) | |
| download | linux-4c0e176dd5e4c44dd60f398518f75eedbe1a65f3.tar.gz linux-4c0e176dd5e4c44dd60f398518f75eedbe1a65f3.tar.xz | |
Merge /spare/repo/linux-2.6/
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 42187381506b..850a78c9c4bc 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -261,7 +261,11 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma) static int mmap_kmem(struct file * file, struct vm_area_struct * vma) { - unsigned long long val; + unsigned long pfn; + + /* Turn a kernel-virtual address into a physical page frame */ + pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT; + /* * RED-PEN: on some architectures there is more mapped memory * than available in mem_map which pfn_valid checks @@ -269,10 +273,10 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma) * * RED-PEN: vmalloc is not supported right now. */ - if (!pfn_valid(vma->vm_pgoff)) + if (!pfn_valid(pfn)) return -EIO; - val = (u64)vma->vm_pgoff << PAGE_SHIFT; - vma->vm_pgoff = __pa(val) >> PAGE_SHIFT; + + vma->vm_pgoff = pfn; return mmap_mem(file, vma); } |