Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1633383
| From | Matthew Wilcox <willy@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC v3 05/17] RCU free VMAs |
| Date | 2017-04-30 07:10 +0200 |
| Message-ID | <tBPhn-7vt-3@gated-at.bofh.it> (permalink) |
| References | <tATZL-2FN-3@gated-at.bofh.it> <tATZM-2FN-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Apr 27, 2017 at 05:52:44PM +0200, Laurent Dufour wrote:
> +static inline bool vma_is_dead(struct vm_area_struct *vma, unsigned int sequence)
> +{
> + int ret = RB_EMPTY_NODE(&vma->vm_rb);
> + unsigned seq = ACCESS_ONCE(vma->vm_sequence.sequence);
> +
> + /*
> + * Matches both the wmb in write_seqlock_{begin,end}() and
> + * the wmb in vma_rb_erase().
> + */
> + smp_rmb();
> +
> + return ret || seq != sequence;
> +}
Hang on, this isn't vma_is_dead(). This is vma_has_changed() (possibly
from live to dead, but also possibly grown or shrunk; see your earlier
patch).
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[RFC v3 05/17] RCU free VMAs Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-27 18:00 +0200
Re: [RFC v3 05/17] RCU free VMAs "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-27 20:30 +0200
Re: [RFC v3 05/17] RCU free VMAs Matthew Wilcox <willy@infradead.org> - 2017-04-30 07:00 +0200
Re: [RFC v3 05/17] RCU free VMAs Matthew Wilcox <willy@infradead.org> - 2017-04-30 07:10 +0200
Re: [RFC v3 05/17] RCU free VMAs Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-03 09:30 +0200
csiph-web