linux-kernel - RE: [Patch v1 2/4] RDMA/mana_ib: create and process EQ events

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Date:   Mon, 27 Nov 2023 19:00:21 +0000
From:   Long Li <longli@...rosoft.com>
To:     Simon Horman <horms@...nel.org>,
        "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>
CC:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Patch v1 2/4] RDMA/mana_ib: create and process EQ events

> > @@ -505,14 +507,24 @@ static void mana_gd_deregiser_irq(struct
> gdma_queue *queue)
> >       if (WARN_ON(msix_index >= gc->num_msix_usable))
> >               return;
> >
> > +     spin_lock_irqsave(&r->lock, flags);
> > +
> >       gic = &gc->irq_contexts[msix_index];
> > -     gic->handler = NULL;
> > -     gic->arg = NULL;
> > +     list_for_each_rcu(p, &gic->eq_list) {
> > +             eq = list_entry(p, struct gdma_queue, entry);
> 
> Hi Long Li,
> 
> Sparse complains a bit about this construction:
> 
>  .../gdma_main.c:513:9: error: incompatible types in comparison expression
> (different address spaces):
>  .../gdma_main.c:513:9:    struct list_head [noderef] __rcu *
>  .../gdma_main.c:513:9:    struct list_head *
>  .../gdma_main.c:513:9: error: incompatible types in comparison expression
> (different address spaces):
>  .../gdma_main.c:513:9:    struct list_head [noderef] __rcu *
>  .../gdma_main.c:513:9:    struct list_head *
> 
> Perhaps using list_for_each_entry_rcu() is appropriate here.

Thank you, I will fix this.

Long