powerpc/64: Remove PPC64 special case for cputime accounting default

Distro kernels tend to be moving to VIRT_CPU_ACCOUNTING_GEN, and there
is not much reason why PPC64 should be special here. Remove the special
case and make the ppc64 and pseries defconfigs use GEN accounting
(others will use TICK, as-per Kconfig defaults).

VIRT_CPU_ACCOUNTING_NATIVE does provide scaled vtime and stolen time
apportioned between system and user time, and vtime accounting is not
unconditionally enabled, and possibly other things. But it would be
better at this point to extend GEN to cover important missing features
rather than directing users back to a less used option.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220902085316.2071519-4-npiggin@gmail.com

diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index c8b0e80..6be0c43 100644 (file)
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -1,7 +1,9 @@
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
+# CONFIG_CONTEXT_TRACKING_USER_FORCE is not set
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
+CONFIG_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_IKCONFIG=y

diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig
index c05e37a..117643d 100644 (file)
--- a/arch/powerpc/configs/pseries_defconfig
+++ b/arch/powerpc/configs/pseries_defconfig
@@ -3,8 +3,10 @@ CONFIG_NR_CPUS=2048
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
 CONFIG_AUDIT=y
+# CONFIG_CONTEXT_TRACKING_USER_FORCE is not set
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
+CONFIG_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_TASK_XACCT=y

diff --git a/init/Kconfig b/init/Kconfig
index 532362f..94ce5a4 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -461,8 +461,7 @@ config VIRT_CPU_ACCOUNTING
 
 choice
        prompt "Cputime accounting"
-       default TICK_CPU_ACCOUNTING if !PPC64
-       default VIRT_CPU_ACCOUNTING_NATIVE if PPC64
+       default TICK_CPU_ACCOUNTING
 
 # Kind of a stub config for the pure tick based cputime accounting
 config TICK_CPU_ACCOUNTING