patch-2.4.10 linux/arch/alpha/kernel/smp.c

• Lines: 65
• Date: Thu Sep 13 15:21:32 2001
• Orig file: v2.4.9/linux/arch/alpha/kernel/smp.c
• Orig date: Mon Aug 27 12:41:38 2001

diff -u --recursive --new-file v2.4.9/linux/arch/alpha/kernel/smp.c linux/arch/alpha/kernel/smp.c
@@ -1,5 +1,13 @@
 /*
  *	linux/arch/alpha/kernel/smp.c
+ *
+ *      2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
+ *            Renamed modified smp_call_function to smp_call_function_on_cpu()
+ *            Created an function that conforms to the old calling convention
+ *            of smp_call_function().
+ *
+ *            This is helpful for DCPI.
+ *
  */
 
 #include <linux/errno.h>
@@ -867,23 +875,31 @@
  */
 
 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 retry,
+			  int wait, unsigned long to_whom)
 {
-	unsigned long to_whom = cpu_present_mask ^ (1UL << smp_processor_id());
 	struct smp_call_struct data;
 	long timeout;
+	int num_cpus_to_call;
+	long i,j;
 	
 	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);
+
+	to_whom &= ~(1L << smp_processor_id());
+	for (i = 0, j = 1, num_cpus_to_call = 0; i < NR_CPUS; ++i, j <<= 1)
+		if (to_whom & j)
+			num_cpus_to_call++;
+
+	atomic_set(&data.unstarted_count, num_cpus_to_call);
+	atomic_set(&data.unfinished_count, num_cpus_to_call);
 
 	/* Acquire the smp_call_function_data mutex.  */
 	if (pointer_lock(&smp_call_function_data, &data, retry))
 		return -EBUSY;
 
-	/* Send a message to all other CPUs.  */
+	/* Send a message to the requested CPUs.  */
 	send_ipi_message(to_whom, IPI_CALL_FUNC);
 
 	/* Wait for a minimal response.  */
@@ -905,6 +921,13 @@
 	}
 
 	return 0;
+}
+
+int
+smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
+{
+	return smp_call_function_on_cpu (func, info, retry, wait,
+					 cpu_present_mask);
 }
 
 static void