[PATCH] stm: select CONFIG_SRCU

[Russell King - ARM Linux]

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 at arndb.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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