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authorDave Hansen <dave.hansen@linux.intel.com>2021-10-19 01:15:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-10-19 09:22:02 +0300
commit76af6a054da4055305ddb28c5eb151b9ee4f74f9 (patch)
treee34d52b5a37b46a5bb8f7541e3976dd10efa5922 /include/linux/memory.h
parent295be91f7ef0027fca2f2e4788e99731aa931834 (diff)
downloadlinux-76af6a054da4055305ddb28c5eb151b9ee4f74f9.tar.xz
mm/migrate: add CPU hotplug to demotion #ifdef
Once upon a time, the node demotion updates were driven solely by memory hotplug events. But now, there are handlers for both CPU and memory hotplug. However, the #ifdef around the code checks only memory hotplug. A system that has HOTPLUG_CPU=y but MEMORY_HOTPLUG=n would miss CPU hotplug events. Update the #ifdef around the common code. Add memory and CPU-specific #ifdefs for their handlers. These memory/CPU #ifdefs avoid unused function warnings when their Kconfig option is off. [arnd@arndb.de: rework hotplug_memory_notifier() stub] Link: https://lkml.kernel.org/r/20211013144029.2154629-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20210924161255.E5FE8F7E@davehans-spike.ostc.intel.com Fixes: 884a6e5d1f93 ("mm/migrate: update node demotion order on hotplug events") Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Wei Xu <weixugc@google.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Yang Shi <yang.shi@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memory.h')
-rw-r--r--include/linux/memory.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 7efc0a7c14c9..182c606adb06 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -160,7 +160,10 @@ int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
#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) ({ 0; })
+static inline int hotplug_memory_notifier(notifier_fn_t fn, int pri)
+{
+ return 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); })