netdev - Re: [PATCH net v3] ipv6: sr: fix several BUGs when preemption is enabled

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Message-Id: <20170113.123052.335826935080532600.davem@davemloft.net>
Date:   Fri, 13 Jan 2017 12:30:52 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     david.lebrun@...ouvain.be
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net v3] ipv6: sr: fix several BUGs when preemption is
 enabled

From: David Lebrun <david.lebrun@...ouvain.be>
Date: Thu, 12 Jan 2017 21:30:01 +0100

> When CONFIG_PREEMPT=y, CONFIG_IPV6=m and CONFIG_SEG6_HMAC=y,
> seg6_hmac_init() is called during the initialization of the ipv6 module.
> This causes a subsequent call to smp_processor_id() with preemption
> enabled, resulting in the following trace.
 ...
> Moreover, dst_cache_* functions also call smp_processor_id(), generating
> a similar trace.
> 
> This patch uses raw_cpu_ptr() in seg6_hmac_init() rather than this_cpu_ptr()
> and disable preemption when using dst_cache_* functions.
> 
> Signed-off-by: David Lebrun <david.lebrun@...ouvain.be>

Applied, thanks.