linux-kernel - [PATCH 08/11] smp: Move __smp_call_function

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Message-Id: <1393256402-16907-9-git-send-email-fweisbec@gmail.com>
Date:	Mon, 24 Feb 2014 16:39:59 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jan Kara <jack@...e.cz>,
	Jens Axboe <axboe@...com>
Subject: [PATCH 08/11] smp: Move __smp_call_function_single() below its safe version

Move this function closer to __smp_call_function_single(). These functions
have very similar behavior and should be displayed in the same block
for clarity.

Reviewed-by: Jan Kara <jack@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jan Kara <jack@...e.cz>
Cc: Jens Axboe <axboe@...com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/smp.c | 64 ++++++++++++++++++++++++++++++------------------------------
 1 file changed, 32 insertions(+), 32 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 64bb0d4..fa04ab9 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -237,6 +237,38 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info,
 }
 EXPORT_SYMBOL(smp_call_function_single);
 
+/**
+ * __smp_call_function_single(): Run a function on a specific CPU
+ * @cpu: The CPU to run on.
+ * @csd: Pre-allocated and setup data structure
+ * @wait: If true, wait until function has completed on specified CPU.
+ *
+ * Like smp_call_function_single(), but allow caller to pass in a
+ * pre-allocated data structure. Useful for embedding @data inside
+ * other structures, for instance.
+ */
+int __smp_call_function_single(int cpu, struct call_single_data *csd, int wait)
+{
+	int err = 0;
+	int this_cpu;
+
+	this_cpu = get_cpu();
+	/*
+	 * Can deadlock when called with interrupts disabled.
+	 * We allow cpu's that are not yet online though, as no one else can
+	 * send smp call function interrupt to this cpu and as such deadlocks
+	 * can't happen.
+	 */
+	WARN_ON_ONCE(cpu_online(this_cpu) && wait && irqs_disabled()
+		     && !oops_in_progress);
+
+	err = generic_exec_single(cpu, csd, csd->func, csd->info, wait);
+	put_cpu();
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(__smp_call_function_single);
+
 /*
  * smp_call_function_any - Run a function on any of the given cpus
  * @mask: The mask of cpus it can run on.
@@ -281,38 +313,6 @@ call:
 EXPORT_SYMBOL_GPL(smp_call_function_any);
 
 /**
- * __smp_call_function_single(): Run a function on a specific CPU
- * @cpu: The CPU to run on.
- * @csd: Pre-allocated and setup data structure
- * @wait: If true, wait until function has completed on specified CPU.
- *
- * Like smp_call_function_single(), but allow caller to pass in a
- * pre-allocated data structure. Useful for embedding @data inside
- * other structures, for instance.
- */
-int __smp_call_function_single(int cpu, struct call_single_data *csd, int wait)
-{
-	int err = 0;
-	int this_cpu;
-
-	this_cpu = get_cpu();
-	/*
-	 * Can deadlock when called with interrupts disabled.
-	 * We allow cpu's that are not yet online though, as no one else can
-	 * send smp call function interrupt to this cpu and as such deadlocks
-	 * can't happen.
-	 */
-	WARN_ON_ONCE(cpu_online(this_cpu) && wait && irqs_disabled()
-		     && !oops_in_progress);
-
-	err = generic_exec_single(cpu, csd, csd->func, csd->info, wait);
-	put_cpu();
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(__smp_call_function_single);
-
-/**
  * smp_call_function_many(): Run a function on a set of other CPUs.
  * @mask: The set of cpus to run on (only runs on online subset).
  * @func: The function to run. This must be fast and non-blocking.
-- 
1.8.3.1

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