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authorFrederic Weisbecker <fweisbec@gmail.com>2014-02-24 16:39:59 +0100
committerJens Axboe <axboe@fb.com>2014-02-24 14:47:01 -0800
commitd7877c03f1b62de06f9c00417952f39f56c1ab00 (patch)
tree0f3e9bacdf56eaa5b104bfb03455e8e7c34e9453 /kernel/smp.c
parent8b28499a71d3431c9128abc743e2d2bfbdae3ed4 (diff)
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@suse.cz> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@fb.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'kernel/smp.c')
-rw-r--r--kernel/smp.c64
1 files changed, 32 insertions, 32 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 64bb0d48e96f..fa04ab938e52 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.