Bill Wendling wrote:
>
> Hi Linus,
>
> Here's a small optimization for the mm/filemap.c file.
>
> - The `head = &mapping->pages;' statement is useless inside the
> repeat, since head isn't modified inside the loop.
> - The `curr = curr->next;' statement doesn't need to be executed
> if the repeat is taken. I changed the while() into a for() loop
> to accomodate this better.
>
I spotted the curr = curr->next thing yesterday, too! I think you're
right on that one. But I'm not sure about the head = &mapping thing.
The reason we jump back here is that we've been outside the spinlock'ed
critical section. Is it possible for the &mapping->pages to change
during this period of time (when spinlock isn't held?), if not, your
patch is ok. If it could change, we need to re-initialize head because
it could have changed while we didn't have the lock locked.
David Mansfield
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