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SubjectRe: [PATCH 02/24] io-controller: Core of the elevator fair queuing
On Thu, Aug 27, 2009 at 10:49:40AM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> ...
> > +static void update_min_vdisktime(struct io_service_tree *st)
> > +{
> > + u64 vdisktime;
> > +
> > + if (st->active_entity)
> > + vdisktime = st->active_entity->vdisktime;
> > +
> > + if (st->rb_leftmost) {
> > + struct io_entity *entity = rb_entry(st->rb_leftmost,
> > + struct io_entity, rb_node);
> > +
> > + if (!st->active_entity)
> > + vdisktime = entity->vdisktime;
> > + else
> > + vdisktime = min_vdisktime(vdisktime, entity->vdisktime);
> > + }
> > +
> > + st->min_vdisktime = max_vdisktime(st->min_vdisktime, vdisktime);
> > +}
>
> block/elevator-fq.c: In function ‘elv_ioq_slice_expired’:
> block/elevator-fq.c:132: warning: ‘vdisktime’ may be used uninitialized in this function
> LD block/built-in.o
>
> We'd better initialize vdisktime at first.
>

Thanks Gui. Will fix in next posting.

Vivek

> Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
> ---
> block/elevator-fq.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/block/elevator-fq.c b/block/elevator-fq.c
> index d04e925..a4161c2 100644
> --- a/block/elevator-fq.c
> +++ b/block/elevator-fq.c
> @@ -131,6 +131,8 @@ static void update_min_vdisktime(struct io_service_tree *st)
> {
> u64 vdisktime;
>
> + vdisktime = st->min_vdisktime;
> +
> if (st->active_entity)
> vdisktime = st->active_entity->vdisktime;
>
> --
> 1.5.4.rc3
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