On Tue, Mar 22, 2011 at 10:28:33AM -0700, Robert Love wrote:
> On Thu, 2011-03-17 at 20:41 -0700, Lai Jiangshan wrote:
> >
> > The rcu callback fc_rport_free_rcu() just calls a kfree(),
> > so we use kfree_rcu() instead of the call_rcu(fc_rport_free_rcu).
> >
> > Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
> > ---
> > drivers/scsi/libfc/fc_rport.c | 14 +-------------
> > 1 files changed, 1 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
> > index a7175ad..29abab0 100644
> > --- a/drivers/scsi/libfc/fc_rport.c
> > +++ b/drivers/scsi/libfc/fc_rport.c
> > @@ -151,18 +151,6 @@ static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
> > }
> >
> > /**
> > - * fc_rport_free_rcu() - Free a remote port
> > - * @rcu: The rcu_head structure inside the remote port
> > - */
> > -static void fc_rport_free_rcu(struct rcu_head *rcu)
> > -{
> > - struct fc_rport_priv *rdata;
> > -
> > - rdata = container_of(rcu, struct fc_rport_priv, rcu);
> > - kfree(rdata);
> > -}
> > -
> > -/**
> > * fc_rport_destroy() - Free a remote port after last reference is released
> > * @kref: The remote port's kref
> > */
> > @@ -171,7 +159,7 @@ static void fc_rport_destroy(struct kref *kref)
> > struct fc_rport_priv *rdata;
> >
> > rdata = container_of(kref, struct fc_rport_priv, kref);
> > - call_rcu(&rdata->rcu, fc_rport_free_rcu);
> > + kfree_rcu(rdata, rcu);
>
> I think this last line should be:
>
> kfree_rcu(rdata, &rdata->rcu);
Hello, Robert,
I believe that it is correct as is. The kfree_rcu() definition is as
follows:
#define kfree_rcu(ptr, rcu_head) \
__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
Then __kfree_rcu() encodes the offset into the rcu_head so that it can
be handled properly at the end of the grace period.
Thanx, Paul
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