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

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Date:	Sat, 25 Aug 2007 00:40:49 +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: [PATCH] Redefine {un}register_hotcpu_notifier() !HOTPLUG_CPU stubs

Hi Andrew,

As discussed just now, please drop:
redefine-unregister_hotcpu_notifier-hotplug_cpu.patch
and apply the patch below instead.

Satyam

[PATCH] Redefine {un}register_hotcpu_notifier() !HOTPLUG_CPU stubs

The return of the present "do {} while" based stub definition of
register_hotcpu_notifier() cannot be checked. This makes the stub
asymmetric w.r.t. the real HOTPLUG_CPU=y implementation that is
int-returning. So let us redefine this to be consistent with the
full version. Also do the same for unregister_hotcpu_notifier().

We cannot define these as static inline functions due to an existing
GCC bug (#33172). So define as macros that return appropriately
instead (int '0' for the register_hotcpu_notifier case and void for
unregister_hotcpu_notifier).

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

---

 include/linux/cpu.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 1d5ded0..2ffcef5 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -119,8 +119,9 @@ 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)
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
+#define unregister_hotcpu_notifier(nb)	({ (void)(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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