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powerpc/pseries: Always enable CONFIG_HOTPLUG_CPU on PSERIES SMP

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Adam Lackorzynski reported the following build failure on
!CONFIG_HOTPLUG_CPU configuration:

  CC      arch/powerpc/kernel/rtas.o
arch/powerpc/kernel/rtas.c: In function ‘rtas_cpu_state_change_mask’:
arch/powerpc/kernel/rtas.c:843:4: error: implicit declaration of function ‘cpu_down’ [-Werror=implicit-function-declaration]
cc1: all warnings being treated as errors
make[1]: *** [arch/powerpc/kernel/rtas.o] Error 1
make: *** [arch/powerpc/kernel] Error 2

The build fails because cpu_down() is defined only under CONFIG_HOTPLUG_CPU.

Looking further, the mobility code in pseries is one of the call-sites which
uses rtas_ibm_suspend_me(), which in turn calls rtas_cpu_state_change_mask().
And the mobility code is unconditionally compiled-in (it does not fall under
any Kconfig option). And commit 120496ac (powerpc: Bring all threads online
prior to migration/hibernation) which introduced this build regression is
critical for the proper functioning of the migration code. So it appears
that the only solution to this problem is to enable CONFIG_HOTPLUG_CPU if
SMP is enabled on PPC_PSERIES platforms. So make that change in the Kconfig.

Reported-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Cc: stable@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Srivatsa S. Bhat 2013-05-21 09:32:48 +00:00 committed by Benjamin Herrenschmidt
parent 8e44ddc3f3
commit f274ef8747
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/platforms/pseries/Kconfig
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@ -19,6 +19,8 @@ config PPC_PSERIES
select ZLIB_DEFLATE
select PPC_DOORBELL
select HAVE_CONTEXT_TRACKING
select HOTPLUG if SMP
select HOTPLUG_CPU if SMP
default y
config PPC_SPLPAR