linux-kernel - Re: [PATCH V8 5/8] percpu-refcount: introduce __percpu_ref_tryget

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Message-ID: <1507056023.2567.1.camel@wdc.com>
Date:   Tue, 3 Oct 2017 18:40:24 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "axboe@...com" <axboe@...com>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jthumshirn@...e.de" <jthumshirn@...e.de>,
        "martin@...htvoll.de" <martin@...htvoll.de>,
        Bart Van Assche <Bart.VanAssche@....com>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
        "hare@...e.com" <hare@...e.com>, "tj@...nel.org" <tj@...nel.org>,
        "cavery@...hat.com" <cavery@...hat.com>
Subject: Re: [PATCH V8 5/8] percpu-refcount: introduce
 __percpu_ref_tryget_live

On Tue, 2017-10-03 at 22:04 +0800, Ming Lei wrote:
> Block layer need to call this function after holding
> rcu lock in a real hot path, so introduce this helper.

Since it is allowed to nest rcu_read_lock_sched() calls I don't think
that this patch is necessary.

Bart.