do_mmap_pgoff issue...

[Paul Mackerras]

Gerhard Jaeger writes:

> The facts:
> - mmap the last page @ 0xFFFFF000, len 4K
> - result: mmap says EOVERFLOW...
> - the function that failed was do_mmap_pgoff()
> 
> Here's the pice of code
> 
> /* offset overflow? */
> if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
>     return -EOVERFLOW;
> 
> It's quite clear why it fails in my case:
> pgoff + (len >> PAGE_SHIFT) will be 0

No, pgoff will be 0xfffff, len will be 1, the sum is 0x100000.  You
need to look elsewhere for the problem.

Paul.