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-rw-r--r--arch/powerpc/Kconfig3
-rw-r--r--arch/powerpc/mm/mem.c17
-rw-r--r--kernel/resource.c2
3 files changed, 21 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d55063c021d5..26b963c33c88 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -272,6 +272,9 @@ config HOTPLUG_CPU
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
+config ARCH_HAS_WALK_MEMORY
+ def_bool y
+
config ARCH_ENABLE_MEMORY_HOTREMOVE
def_bool y
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index f0a1fd268b7a..be5c506779a7 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -145,6 +145,23 @@ out:
return ret;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
+
+/*
+ * walk_memory_resource() needs to make sure there is no holes in a given
+ * memory range. On PPC64, since this range comes from /sysfs, the range
+ * is guaranteed to be valid, non-overlapping and can not contain any
+ * holes. By the time we get here (memory add or remove), /proc/device-tree
+ * is updated and correct. Only reason we need to check against device-tree
+ * would be if we allow user-land to specify a memory range through a
+ * system call/ioctl etc. instead of doing offline/online through /sysfs.
+ */
+int
+walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
+ int (*func)(unsigned long, unsigned long, void *))
+{
+ return (*func)(start_pfn, nr_pages, arg);
+}
+
#endif /* CONFIG_MEMORY_HOTPLUG */
void show_mem(void)
diff --git a/kernel/resource.c b/kernel/resource.c
index 2eb553d9b517..82aea814d409 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -228,7 +228,7 @@ int release_resource(struct resource *old)
EXPORT_SYMBOL(release_resource);
-#ifdef CONFIG_MEMORY_HOTPLUG
+#if defined(CONFIG_MEMORY_HOTPLUG) && !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
/*
* Finds the lowest memory reosurce exists within [res->start.res->end)
* the caller must specify res->start, res->end, res->flags.