linux-kernel - [PATCH 3/3] smp_call_function_interrupt: use typedef and %pf

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Date:	Tue, 01 Feb 2011 01:12:48 -0600
From:	Milton Miller <miltonm@....com>
To:	akpm@...ux-foundation.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Anton Blanchard <anton@...ba.org>,
	xiaoguangrong@...fujitsu.com, mingo@...e.hu, jaxboe@...ionio.com,
	npiggin@...il.com, rusty@...tcorp.com.au,
	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	efault@....de, benh@...nel.crashing.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] smp_call_function_interrupt: use typedef and %pf

Use the newly added smp_call_func_t in smp_call_function_interrupt
for the func variable, and make the comment above the WARN more assertive
and explicit.  Also, func is a function pointer and does not need an
offset, so use %pf not %pS.

Signed-off-by: Milton Miller <miltonm@....com>

Index: linux-2.6/kernel/smp.c
===================================================================
--- linux-2.6.orig/kernel/smp.c	2011-01-31 18:08:37.906766468 -0600
+++ linux-2.6/kernel/smp.c	2011-01-31 18:21:38.703754925 -0600
@@ -194,7 +194,7 @@ void generic_smp_call_function_interrupt
 	 */
 	list_for_each_entry_rcu(data, &call_function.queue, csd.list) {
 		int refs;
-		void (*func) (void *info);
+		smp_call_func_t func;
 
 		/*
 		 * Since we walk the list without any locks, we might
@@ -218,12 +218,13 @@ void generic_smp_call_function_interrupt
 		data->csd.func(data->csd.info);
 
 		/*
-		 * If the cpu mask is not still set then it enabled interrupts,
-		 * we took another smp interrupt, and executed the function
-		 * twice on this cpu.  In theory that copy decremented refs.
+		 * If the cpu mask is not still set then func enabled
+		 * interrupts (BUG), and this cpu took another smp call
+		 * function interrupt and executed func(info) twice
+		 * on this cpu.  That nested execution decremented refs.
 		 */
 		if (!cpumask_test_and_clear_cpu(cpu, data->cpumask)) {
-			WARN(1, "%pS enabled interrupts and double executed\n",
+			WARN(1, "%pf enabled interrupts and double executed\n",
 			     func);
 			continue;
 		}
--
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