On Tue, Mar 12, 2013 at 06:04:16PM +0100, Jiri Olsa wrote:
> On Tue, Mar 12, 2013 at 05:24:50PM +0100, Peter Zijlstra wrote:
> > Right you are..
> >
> > How about something like the below; using that 0 << -1 is still 0.
>
> hum.. we are obviously not on the same page wrt 'confusing' ;-)
>
> looks ok, I'll test it
hi, it work's fine..
Tested-by: Jiri Olsa <jo...@redhat.com>
>
> jirka
>
> >
> > ---
> > kernel/events/ring_buffer.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
> > index 23cb34f..e72ca70 100644
> > --- a/kernel/events/ring_buffer.c
> > +++ b/kernel/events/ring_buffer.c
> > @@ -316,7 +316,7 @@ void rb_free(struct ring_buffer *rb)
> > struct page *
> > perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)
> > {
> > - if (pgoff > (1UL << page_order(rb)))
> > + if (pgoff > (rb->nr_pages << page_order(rb)))
> > return NULL;
> >
> > return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE);
> > @@ -336,10 +336,10 @@ static void rb_free_work(struct work_struct *work)
> > int i, nr;
> >
> > rb = container_of(work, struct ring_buffer, work);
> > - nr = 1 << page_order(rb);
> > + nr = rb->nr_pages << page_order(rb);
> >
> > base = rb->user_page;
> > - for (i = 0; i < nr + 1; i++)
> > + for (i = 0; i <= nr; i++)
> > perf_mmap_unmark_page(base + (i * PAGE_SIZE));
> >
> > vfree(base);
> > @@ -373,7 +373,7 @@ struct ring_buffer *rb_alloc(int nr_pages, long
> > watermark, int cpu, int flags)
> > rb->user_page = all_buf;
> > rb->data_pages[0] = all_buf + PAGE_SIZE;
just a nit pick.. in case of having just user page,
data_pages[0] holds wrong pointer, but it 'should'
be never touch in this case
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