Hugh Dickins <[email protected]> wrote:
>
> Remove use of FIRST_USER_PGD_NR from sys_mincore: it's inconsistent (no
> other syscall refers to it), unnecessary (sys_mincore loops over vmas
> further down) and incorrect (misses user addresses in ARM's first pgd).
You should make it use FIRST_USER_ADDRESS instead. This check allows NULL
pointers and suchlike to be weeded out before having to take the semaphore.
Also, just because no other syscall refers to such a value doesn't mean that
this one shouldn't and that others shouldn't.
David
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