linux-kernel - Re: [PATCH] net: deinline netif_tx_stop_queue() and netif_tx_stop_all

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 8 May 2015 10:30:03 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jpirko@...hat.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] net: deinline netif_tx_stop_queue() and
 netif_tx_stop_all_queues()

On Fri, May 08, 2015 at 08:50:37AM -0700, Alexander Duyck wrote:
> 
> >>>         f0 80 8f e0 01 00 00 01 lock orb $0x1,0x1e0(%rdi)
> >>This is your set bit operation.  If you were to drop the whole WARN_ON
> >>then this is the only thing you would be inlining.
> >It's up to networking people to decide. I would happily send a patch which drops
> >WARN_ON if they say that's ok with them. Davem?
> 
> This was added under commit 18543a643fae6 ("net: Detect and ignore
> netif_stop_queue() calls before register_netdev()").  I think the time for
> allowing drivers to ignore the WARN_ON has passed and at this point they
> should be strongly encouraged to fix the issue via a NULL pointer
> dereference if they still haven't gotten the issue resolved so we can track
> them down and fix them.  I'd say add a comment here in case someone triggers
> this and does some debugging, but the WARN_ON at this point has proven it is
> too expensive.

+1
5 years for this WARN_ON was enough. Time to remove it.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/