---

yaml
---
r: 21549
b: refs/heads/master
c: 8935dce
h: refs/heads/master
i:
  21547: 28d18f7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 17b0e199a10184d8c5bbbd79a4cee993bb1fb257
+refs/heads/master: 8935dced547afbf37d0fcfcac9a3556494e53104

trunk/arch/sparc64/Kconfig

@@ -356,6 +356,15 @@ config SOLARIS_EMUL
 
 endmenu
 
+config SCHED_SMT
+	bool "SMT (Hyperthreading) scheduler support"
+	depends on SMP
+	default y
+	help
+	  SMT scheduler support improves the CPU scheduler's decision making
+	  when dealing with UltraSPARC cpus at a cost of slightly increased
+	  overhead in some places. If unsure say N here.
+
 config CMDLINE_BOOL
 	bool "Default bootloader kernel arguments"
 

trunk/arch/sparc64/kernel/smp.c

@@ -47,6 +47,8 @@ static unsigned char boot_cpu_id;
 
 cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
 cpumask_t phys_cpu_present_map __read_mostly = CPU_MASK_NONE;
+cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly =
+	{ [0 ... NR_CPUS-1] = CPU_MASK_NONE };
 static cpumask_t smp_commenced_mask;
 static cpumask_t cpu_callout_map;
 
@@ -1291,6 +1293,8 @@ int setup_profiling_timer(unsigned int multiplier)
 /* Constrain the number of cpus to max_cpus.  */
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
+	int i;
+
 	if (num_possible_cpus() > max_cpus) {
 		int instance, mid;
 
@@ -1305,6 +1309,20 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		}
 	}
 
+	for_each_cpu(i) {
+		if (tlb_type == hypervisor) {
+			int j;
+
+			/* XXX get this mapping from machine description */
+			for_each_cpu(j) {
+				if ((j >> 2) == (i >> 2))
+					cpu_set(j, cpu_sibling_map[i]);
+			}
+		} else {
+			cpu_set(i, cpu_sibling_map[i]);
+		}
+	}
+
 	smp_store_cpu_info(boot_cpu_id);
 }
 

trunk/include/asm-sparc64/smp.h

@@ -33,6 +33,8 @@
 extern cpumask_t phys_cpu_present_map;
 #define cpu_possible_map phys_cpu_present_map
 
+extern cpumask_t cpu_sibling_map[NR_CPUS];
+
 /*
  *	General functions that each host system must provide.
  */