linux-kernel - Re: [PATCH 01/18] drivers core: Add I/O ASID allocator

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Date:   Tue, 9 Apr 2019 03:04:36 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: Re: [PATCH 01/18] drivers core: Add I/O ASID allocator

On Tue, Apr 09, 2019 at 01:00:49PM +0300, Andriy Shevchenko wrote:
> I think it makes sense to add a helper macro to rcupdate.h
> (and we have several cases in kernel that can utilize it)
> 
> #define kfree_non_null_rcu(ptr, rcu_head)		\
> 	do {						\
> 		if (ptr)				\
> 			kfree_rcu(ptr, rcu_head);	\
> 	} while (0)
> 
> as a more common pattern for resource deallocators.

I think that should move straight into kfree_rcu.  In general
we expect *free* to deal with NULL pointers transparently, so we
should do so here as well.