From: Peter Zijlstra <peterz@infradead.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
Ingo Molnar <mingo@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Johannes Berg <johannes@sipsolutions.net>,
Alexander Aring <alex.aring@gmail.com>,
Stefan Schmidt <stefan@osg.samsung.com>,
netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-wpan@vger.kernel.org,
Anna-Maria Gleixner <anna-maria@linutronix.de>
Subject: Re: [RFC PATCH 2/2] net: mac808211: mac802154: use lockdep_assert_in_softirq() instead own warning
Date: Fri, 4 May 2018 20:51:32 +0200 [thread overview]
Message-ID: <20180504185132.GV12217@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180504184538.gavk7e2vtm73e32w@linutronix.de>
On Fri, May 04, 2018 at 08:45:39PM +0200, Sebastian Andrzej Siewior wrote:
> On 2018-05-04 20:32:49 [+0200], Peter Zijlstra wrote:
> > On Fri, May 04, 2018 at 07:51:44PM +0200, Sebastian Andrzej Siewior wrote:
> > > From: Anna-Maria Gleixner <anna-maria@linutronix.de>
> > >
> > > The warning in ieee802154_rx() and ieee80211_rx_napi() is there to ensure
> > > the softirq context for the subsequent netif_receive_skb() call.
> >
> > That's not in fact what it does though; so while that might indeed be
> > the intent that's not what it does.
>
> It was introduced in commit d20ef63d3246 ("mac80211: document
> ieee80211_rx() context requirement"):
>
> mac80211: document ieee80211_rx() context requirement
>
> ieee80211_rx() must be called with softirqs disabled
softirqs disabled, ack that is exactly what it checks.
But afaict the assertion you introduced tests that we are _in_ softirq
context, which is not the same.
next prev parent reply other threads:[~2018-05-04 18:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 17:51 [RFC PATCH 0/2] Introduce assert_in_softirq() Sebastian Andrzej Siewior
2018-05-04 17:51 ` [RFC PATCH 1/2] lockdep: Add a assert_in_softirq() Sebastian Andrzej Siewior
2018-05-04 17:51 ` [RFC PATCH 2/2] net: mac808211: mac802154: use lockdep_assert_in_softirq() instead own warning Sebastian Andrzej Siewior
2018-05-04 18:32 ` Peter Zijlstra
2018-05-04 18:45 ` Sebastian Andrzej Siewior
2018-05-04 18:51 ` Peter Zijlstra [this message]
2018-05-04 19:07 ` Sebastian Andrzej Siewior
2018-05-04 20:09 ` Peter Zijlstra
2018-05-05 7:06 ` Ingo Molnar
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