linux-kernel - Re: [PATCH] Redefine {un}register_hotcpu_notifier() !HOTPLUG

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Date:	Thu, 23 Aug 2007 04:34:43 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Redefine {un}register_hotcpu_notifier() !HOTPLUG_CPU
 stubs as static inline function

[ Eeks, please replace previous patch with this, and change the patch
  name and changelog as per that indicated in this mail -- apologies
  for the inconvenience caused! ]


[PATCH] Redefine {un}register_hotcpu_notifier() !HOTPLUG_CPU stubs as static inline functions

The return of the present "do {} while" based stub definition of
register_hotcpu_notifier() cannot be checked, but the real HOTPLUG_CPU=y
implementation of register_hotcpu_notifier() is int-returning. So let us
make this stub consistent with the full version. Redefining this as such
will also help us remove some #ifdef-ery elsewhere in kernel code, as
shown in forthcoming patch. Also do the same for unregister_xxx case.

Signed-off-by: Satyam Sharma <satyam@...radead.org>

---

 include/linux/cpu.h |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 1d5ded0..6a3697f 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -119,8 +119,13 @@ static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
 #define lock_cpu_hotplug()	do { } while (0)
 #define unlock_cpu_hotplug()	do { } while (0)
 #define hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
-#define register_hotcpu_notifier(nb)	do { (void)(nb); } while (0)
-#define unregister_hotcpu_notifier(nb)	do { (void)(nb); } while (0)
+static inline int register_hotcpu_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+static inline void unregister_hotcpu_notifier(struct notifier_block *nb)
+{
+}
 
 /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
 static inline int cpu_is_offline(int cpu) { return 0; }
-
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