sh: convert to generic helpers for IPI function calls

This converts sh to use the new helpers for smp_call_function() and
friends, and adds support for smp_call_function_single(). Not tested,
but it compiles.

Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

3 files changed, 13 insertions, 50 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 9a854c8e527..3e7384f4619 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -688,6 +688,7 @@ config CRASH_DUMP
 config SMP
         bool "Symmetric multi-processing support"
         depends on SYS_SUPPORTS_SMP
+        select USE_GENERIC_SMP_HELPERS
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 5d039d168f5..2ed8dceb297 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -36,13 +36,6 @@ EXPORT_SYMBOL(cpu_possible_map);
 cpumask_t cpu_online_map;
 EXPORT_SYMBOL(cpu_online_map);
 
-static atomic_t cpus_booted = ATOMIC_INIT(0);
-
-/*
- * Run specified function on a particular processor.
- */
-void __smp_call_function(unsigned int cpu);
-
 static inline void __init smp_store_cpu_info(unsigned int cpu)
 {
         struct sh_cpuinfo *c = cpu_data + cpu;
@@ -178,42 +171,17 @@ void smp_send_stop(void)
         smp_call_function(stop_this_cpu, 0, 1, 0);
 }
 
-struct smp_fn_call_struct smp_fn_call = {
-        .lock           = __SPIN_LOCK_UNLOCKED(smp_fn_call.lock),
-        .finished       = ATOMIC_INIT(0),
-};
-
-/*
- * The caller of this wants the passed function to run on every cpu.  If wait
- * is set, wait until all cpus have finished the function before returning.
- * The lock is here to protect the call structure.
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-int smp_call_function(void (*func)(void *info), void *info, int retry, int wait)
+void arch_send_call_function_ipi(cpumask_t mask)
 {
-        unsigned int nr_cpus = atomic_read(&cpus_booted);
-        int i;
-
-        /* Can deadlock when called with interrupts disabled */
-        WARN_ON(irqs_disabled());
-
-        spin_lock(&smp_fn_call.lock);
-
-        atomic_set(&smp_fn_call.finished, 0);
-        smp_fn_call.fn = func;
-        smp_fn_call.data = info;
-
-        for (i = 0; i < nr_cpus; i++)
-                if (i != smp_processor_id())
-                        plat_send_ipi(i, SMP_MSG_FUNCTION);
-
-        if (wait)
-                while (atomic_read(&smp_fn_call.finished) != (nr_cpus - 1));
+        int cpu;
 
-        spin_unlock(&smp_fn_call.lock);
+        for_each_cpu_mask(cpu, mask)
+                plat_send_ipi(cpu, SMP_MSG_FUNCTION);
+}
 
-        return 0;
+void arch_send_call_function_single_ipi(int cpu)
+{
+        plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
 }
 
 /* Not really SMP stuff ... */
diff --git a/include/asm-sh/smp.h b/include/asm-sh/smp.h
index 9c8d34b07eb..593343cd26e 100644
--- a/include/asm-sh/smp.h
+++ b/include/asm-sh/smp.h
@@ -26,18 +26,10 @@ extern int __cpu_logical_map[NR_CPUS];
 
 #define NO_PROC_ID      (-1)
 
-struct smp_fn_call_struct {
-        spinlock_t lock;
-        atomic_t   finished;
-        void (*fn)(void *);
-        void *data;
-};
-
-extern struct smp_fn_call_struct smp_fn_call;
-
 #define SMP_MSG_FUNCTION        0
 #define SMP_MSG_RESCHEDULE      1
-#define SMP_MSG_NR              2
+#define SMP_MSG_FUNCTION_SINGLE 2
+#define SMP_MSG_NR              3
 
 void plat_smp_setup(void);
 void plat_prepare_cpus(unsigned int max_cpus);
@@ -46,6 +38,8 @@ void plat_start_cpu(unsigned int cpu, unsigned long entry_point);
 void plat_send_ipi(unsigned int cpu, unsigned int message);
 int plat_register_ipi_handler(unsigned int message,
                               void (*handler)(void *), void *arg);
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi(cpumask_t mask);
 
 #else