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Subject[PATCH 10/10] sh: convert to generic helpers for IPI function calls
Date
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.

Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
arch/sh/Kconfig | 1 +
arch/sh/kernel/smp.c | 48 ++++++++----------------------------------------
include/asm-sh/smp.h | 12 ++----------
3 files changed, 11 insertions(+), 50 deletions(-)
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 9a854c8..3e7384f 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 5d039d1..2ed8dce 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 9c8d34b..7982516 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);
--
1.5.6.rc0.40.gd683


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