Re: PROBLEM: mmap_kmem()

[Steven Rostedt <rostedt@goodmis.org>]

On Thu, 2005-08-18 at 11:53 +0300, Valentin Rabinovich wrote:
> Bug in mmap_kmem(), drivers/char/mem.c.
> When mapping the kmem, page alingning seems to mess the address:
> 
>   unsigned long long val;
>   val = (u64)vma->vm_pgoff << PAGE_SHIFT;
>   vma->vm_pgoff = ((unsigned long)val >> PAGE_SHIFT) - PAGE_OFFSET;
>   vma->vm_pgoff = __pa(val) >> PAGE_SHIFT;
> 
> Subtracting 0xc0000000 and shifting is made in wrong order.
> Kernel: 2.6.12.3, 2.6.12.4

This is already fixed in 2.6.13-rc6-git9, so you need to wait for it in
the 2.6.13 release, or better yet, download and test the git release.

-- Steve


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