linux-kernel - Re: linux-next: build failure after merge of the tty tree

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Message-ID: <20140930075239.GA28481@linutronix.de>
Date:	Tue, 30 Sep 2014 09:52:39 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Greg KH <greg@...ah.com>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the tty tree

* Stephen Rothwell | 2014-09-30 17:39:00 [+1000]:

>Hi Greg,
Hi Stephen,

>After merging the tty tree, today's linux-next build (powerpc
>ppc64_defconfig) failed like this:
>
>
>drivers/built-in.o: In function `.serial8250_stop_tx':
>8250_core.c:(.text+0xda1f4): undefined reference to `.__xchg_called_with_bad_pointer'
>drivers/built-in.o: In function `.serial8250_tx_chars':
>(.text+0xda42c): undefined reference to `.__xchg_called_with_bad_pointer'
>drivers/built-in.o: In function `.serial8250_start_tx':
>8250_core.c:(.text+0xda630): undefined reference to `.__xchg_called_with_bad_pointer'
>
>Caused by commit d74d5d1b7288 ("tty: serial: 8250_core: add run time
>pm").  xchg is called with &p->rpm_tx_active and that is an unsigned
>char.  PowerPC (at least) only allows xchg with objects 4 (or 8 on 64
>bit) bytes long.
>
>I have used the version of the tty tree from next-20140926 for today.

this should have been fixed by commit baeb7ef34952f ("tty: serial: 8250:
use 32bit variable for rpm_tx_active") in Greg's tty-next tree. Isn't
this the case or did you fetch the tty tree before Greg pushed it?

Sebastian
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