linux-kernel - Re: [PATCH] stm: select CONFIG

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Date:	Mon, 16 Nov 2015 22:39:02 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] stm: select CONFIG_SRCU

On Mon, Nov 16, 2015 at 10:14:35PM +0100, Arnd Bergmann wrote:
> The newly added STM code uses SRCU, but does not ensure that
> this code is part of the kernel:
> 
> drivers/built-in.o: In function `stm_source_link_show':
> include/linux/srcu.h:221: undefined reference to `__srcu_read_lock'
> include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock'
> drivers/built-in.o: In function `stm_source_link_drop':
> include/linux/srcu.h:221: undefined reference to `__srcu_read_lock'
> include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock'
> 
> This adds a Kconfig 'select' statement like all the other SRCU using
> drivers have.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")

Related to this, I have to ask why if I answer to N to STM, I'm then
presented with the STM driver options in this file.  It's not like
they'll be built, as drivers/Makefile has:

obj-$(CONFIG_STM)               += hwtracing/stm/

so it seems rather pointless..  Maybe the other options here should
be wrapped with if STM..endif ?

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