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SubjectRe: [PATCH][2.5][11/14] smp_call_function_on_cpu - PARISC
Visual inspection says that wouldn't compile, i also changed the locking 
so that call_lock protects smp_call_functon_data for all assignments
instead of acquiring and busy looping on it.

Index: linux-2.5.60/arch/parisc/kernel/smp.c
===================================================================
RCS file: /build/cvsroot/linux-2.5.60/arch/parisc/kernel/smp.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 smp.c
--- linux-2.5.60/arch/parisc/kernel/smp.c 10 Feb 2003 22:15:32 -0000 1.1.1.1
+++ linux-2.5.60/arch/parisc/kernel/smp.c 14 Feb 2003 13:06:54 -0000
@@ -79,6 +79,7 @@
atomic_t unfinished_count;
};
static volatile struct smp_call_struct *smp_call_function_data;
+static spinlock_t call_lock = SPIN_LOCK_UNLOCKED;

enum ipi_message_type {
IPI_NOP=0,
@@ -304,50 +305,48 @@
void
smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }

-
-/**
- * Run a function on all other CPUs.
- * <func> The function to run. This must be fast and non-blocking.
- * <info> An arbitrary pointer to pass to the function.
- * <retry> If true, keep retrying until ready.
- * <wait> If true, wait until function has completed on other CPUs.
- * [RETURNS] 0 on success, else a negative status code.
+/*
+ * smp_call_function_on_cpu - Runs func on all processors in the mask
+ *
+ * @func: The function to run. This must be fast and non-blocking.
+ * @info: An arbitrary pointer to pass to the function.
+ * @wait: If true, wait (atomically) until function has completed on other CPUs.
+ * @mask: The bitmask of CPUs to call the function
+ *
+ * Returns 0 on success, else a negative status code. Does not return until
+ * remote CPUs are nearly ready to execute func or have executed it.
*
- * Does not return until remote CPUs are nearly ready to execute <func>
- * or have executed.
*/

int
-smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
+smp_call_function_on_cpu (void (*func) (void *info), void *info, int wait,
+ unsigned long mask)
{
struct smp_call_struct data;
long timeout;
- static spinlock_t lock = SPIN_LOCK_UNLOCKED;
+ int num_cpus, cpu, i, ret;

+ cpu = get_cpu();
+ mask &= ~(1UL << cpu);
+ num_cpus = hweight64(mask);
+ if (num_cpus == 0) {
+ put_cpu_no_resched();
+ return 0;
+ }
data.func = func;
data.info = info;
data.wait = wait;
- atomic_set(&data.unstarted_count, smp_num_cpus - 1);
- atomic_set(&data.unfinished_count, smp_num_cpus - 1);
-
- if (retry) {
- spin_lock (&lock);
- while (smp_call_function_data != 0)
- barrier();
- }
- else {
- spin_lock (&lock);
- if (smp_call_function_data) {
- spin_unlock (&lock);
- return -EBUSY;
- }
- }
+ atomic_set(&data.unstarted_count, num_cpus);
+ atomic_set(&data.unfinished_count, num_cpus);

+ spin_lock(&call_lock);
smp_call_function_data = &data;
- spin_unlock (&lock);

- /* Send a message to all other CPUs and wait for them to respond */
- send_IPI_allbutself(IPI_CALL_FUNC);
+ /* Send a message to the target CPUs and wait */
+ for (i = 0; i < NR_CPUS; i++) {
+ if (cpu_online(i) && (mask & (1UL << i)))
+ send_IPI_single(i, IPI_CALL_FUNC);
+ }

/* Wait for response */
timeout = jiffies + HZ;
@@ -361,17 +360,26 @@
smp_call_function_data = NULL;
if (atomic_read (&data.unstarted_count) > 0) {
printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d)\n",
- smp_processor_id());
- return -ETIMEDOUT;
+ cpu);
+ ret = -ETIMEDOUT;
+ goto out;
}

while (wait && atomic_read (&data.unfinished_count) > 0)
barrier ();
-
- return 0;
+ ret = 0;
+out:
+ spin_unlock(&call_lock);
+ put_cpu_no_resched();
+ return ret;
}

-
+int
+smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait,
+ unsigned long mask)
+{
+ return smp_call_function_on_cpu(func, info, wait, cpu_online_map);
+}

/*
* Setup routine for controlling SMP activation
-
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