Commit 490f5de5 authored by Jens Axboe's avatar Jens Axboe
Browse files

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: default avatarPaul Mundt <>
Signed-off-by: default avatarJens Axboe <>
parent dbcf4787
......@@ -688,6 +688,7 @@ config CRASH_DUMP
config SMP
bool "Symmetric multi-processing support"
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
......@@ -36,13 +36,6 @@ EXPORT_SYMBOL(cpu_possible_map);
cpumask_t 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 */
atomic_set(&smp_fn_call.finished, 0);
smp_fn_call.fn = func; = 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;
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 ... */
......@@ -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_NR 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);
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