include/linux/memory.h: implement register_hotmemory_notifier()
When CONFIG_MEMORY_HOTPLUG=n, we don't want the memory-hotplug notifier
handlers to be included in the .o files, for space reasons.
The existing hotplug_memory_notifier() tries to handle this but testing
with gcc-4.4.4 shows that it doesn't work - the hotplug functions are
still present in the .o files.
So implement a new register_hotmemory_notifier() which is a copy of
register_hotcpu_notifier(), and which actually works as desired.
hotplug_memory_notifier() and register_memory_notifier() callsites
should be converted to use this new register_hotmemory_notifier().
While we're there, let's repair the existing hotplug_memory_notifier():
it simply stomps on the register_memory_notifier() return value, so
well-behaved code cannot check for errors. Apparently non of the
existing callers were well-behaved :(
Cc: Andrew Shewmaker <agshew@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 45e93b4..0ff6598 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -18,6 +18,7 @@
#include <linux/node.h>
#include <linux/compiler.h>
#include <linux/mutex.h>
+#include <linux/notifier.h>
#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
@@ -127,13 +128,18 @@
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
#ifdef CONFIG_MEMORY_HOTPLUG
-#define hotplug_memory_notifier(fn, pri) { \
+#define hotplug_memory_notifier(fn, pri) ({ \
static __meminitdata struct notifier_block fn##_mem_nb =\
- { .notifier_call = fn, .priority = pri }; \
+ { .notifier_call = fn, .priority = pri };\
register_memory_notifier(&fn##_mem_nb); \
-}
+})
+#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
+#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
#else
-#define hotplug_memory_notifier(fn, pri) do { } while (0)
+#define hotplug_memory_notifier(fn, pri) (0)
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
+#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
#endif
/*