netdev - Re: [PATCH net-next] neigh: Add missing rcu_assign

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Message-ID: <1432823901.7456.2.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 28 May 2015 07:38:21 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	ying.xue@...driver.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] neigh: Add missing rcu_assign_pointer

On Thu, 2015-05-28 at 21:50 +0800, Herbert Xu wrote:

> This patch is indeed bogus but accessing an RCU-protected like
> this will trigger sparse warnings.  So better make it an
> RCU_INIT_POINTER.

A = B;  is perfectly fine since both A and B have the same __rcu
attribute.

Sparse has no warning and should not.

root@...mazet-glaptop2:/usr/src/net# grep CONFIG_SPARSE_RCU_POINTER .config
CONFIG_SPARSE_RCU_POINTER=y
root@...mazet-glaptop2:/usr/src/net# make C=2 CF=-D__CHECK_ENDIAN__ net/core/neighbour.o
...
  CHECK   net/core/neighbour.c

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