cputime: Generalize CONFIG_VIRT_CPU_ACCOUNTING

S390, ia64 and powerpc all define their own version
of CONFIG_VIRT_CPU_ACCOUNTING. Generalize the config
and its description to a single place to avoid
duplication.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>

1 files changed, 1 insertions, 15 deletions

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 30fd01de6be..72afd2888ca 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -1,6 +1,7 @@
 config PPC64
         bool "64-bit kernel"
         default n
+        select HAVE_VIRT_CPU_ACCOUNTING
         help
           This option selects whether a 32-bit or a 64-bit kernel
           will be built.
@@ -337,21 +338,6 @@ config PPC_MM_SLICES
         default y if (!PPC_FSL_BOOK3E && PPC64 && HUGETLB_PAGE) || (PPC_STD_MMU_64 && PPC_64K_PAGES)
         default n
 
-config VIRT_CPU_ACCOUNTING
-        bool "Deterministic task and CPU time accounting"
-        depends on PPC64
-        default y
-        help
-          Select this option to enable more accurate task and CPU time
-          accounting.  This is done by reading a CPU counter on each
-          kernel entry and exit and on transitions within the kernel
-          between system, softirq and hardirq state, so there is a
-          small performance impact.  This also enables accounting of
-          stolen time on logically-partitioned systems running on
-          IBM POWER5-based machines.
-
-          If in doubt, say Y here.
-
 config PPC_HAVE_PMU_SUPPORT
        bool