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Subject[PATCH v6 45/46] CPU hotplug, stop_machine: Decouple CPU hotplug from stop_machine() in Kconfig
Date
Simply dropping HOTPLUG_CPU from the dependency list of STOP_MACHINE will
lead to the following kconfig issue, reported by Fengguang Wu:

"warning: (HAVE_TEXT_POKE_SMP) selects STOP_MACHINE which has unmet direct
dependencies (SMP && MODULE_UNLOAD)"

So drop HOTPLUG_CPU and add HAVE_TEXT_POKE_SMP to the dependency list of
STOP_MACHINE.

And while at it, also cleanup a comment that refers to CPU hotplug being
dependent on stop_machine().

Cc: David Howells <dhowells@redhat.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Suggested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

include/linux/stop_machine.h | 2 +-
init/Kconfig | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index 3b5e910..ce2d3c4 100644
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -120,7 +120,7 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
* @cpus: the cpus to run the @fn() on (NULL = any online cpu)
*
* Description: This is a special version of the above, which assumes cpus
- * won't come or go while it's being called. Used by hotplug cpu.
+ * won't come or go while it's being called.
*/
int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);

diff --git a/init/Kconfig b/init/Kconfig
index be8b7f5..f4f79af 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1711,7 +1711,7 @@ config INIT_ALL_POSSIBLE
config STOP_MACHINE
bool
default y
- depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
+ depends on (SMP && (MODULE_UNLOAD || HAVE_TEXT_POKE_SMP))
help
Need stop_machine() primitive.



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