linux-kernel - Re: [PATCH 2/2] rxrpc: fix undefined behavior in rxrpc_mark_call

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Message-ID: <6677659.qx4okry02K@wuerfel>
Date:   Wed, 31 Aug 2016 21:40:02 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     David Howells <dhowells@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] rxrpc: fix undefined behavior in rxrpc_mark_call_released

On Wednesday, August 31, 2016 6:39:04 PM CEST David Howells wrote:
> Arnd Bergmann <arnd@...db.de> wrote:
> 
> > gcc -Wmaybe-initialized correctly points out a newly introduced bug
> > through which we can end up calling rxrpc_queue_call() for a dead
> > connection:
> 
> How do you turn that on from within the Kbuild system?

You don't, my mistake. My build bot runs with 6e8d666e9253 ("Disable
"maybe-uninitialized" warning globally") disabled, and I had
assumed that Linus left the warning enabled with "make W=1", but
that was incorrect as Trond Myklebust also pointed out.

You still get the warning with "make EXTRA_CFLAGS=-Wmaybe-uninitialized",
which of course nobody normally does.

I'll try to come up with a patch to enable the warning in the W=1
level in the same conditions that used to be enabled up to v4.7.

	Arnd