sparc64: Reclaim trap_block[]->hdesc

This really isn't necessary at all, a local variable suits the
job just fine.

This frees up 8 bytes in the trap_block[] that we can use later
to store the per-cpu base addresses.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/include/asm/cpudata_64.h b/arch/sparc/include/asm/cpudata_64.h
index a11b89e..c58d87b 100644 (file)
--- a/arch/sparc/include/asm/cpudata_64.h
+++ b/arch/sparc/include/asm/cpudata_64.h
@@ -80,7 +80,7 @@ struct trap_per_cpu {
        unsigned int            dev_mondo_qmask;
        unsigned int            resum_qmask;
        unsigned int            nonresum_qmask;
-       void                    *hdesc;
+       unsigned long           __unused;
 } __attribute__((aligned(64)));
 extern struct trap_per_cpu trap_block[NR_CPUS];
 extern void init_cur_cpu_trap(struct thread_info *);

diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index f7642e5..4226d0e 100644 (file)
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -278,7 +278,7 @@ static unsigned long kimage_addr_to_ra(void *p)
        return kern_base + (val - KERNBASE);
 }
 
-static void __cpuinit ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
+static void __cpuinit ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg, void **descrp)
 {
        extern unsigned long sparc64_ttable_tl0;
        extern unsigned long kern_locked_tte_data;
@@ -298,12 +298,12 @@ static void __cpuinit ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread
                       "hvtramp_descr.\n");
                return;
        }
+       *descrp = hdesc;
 
        hdesc->cpu = cpu;
        hdesc->num_mappings = num_kernel_image_mappings;
 
        tb = &trap_block[cpu];
-       tb->hdesc = hdesc;
 
        hdesc->fault_info_va = (unsigned long) &tb->fault_info;
        hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
@@ -341,12 +341,12 @@ static struct thread_info *cpu_new_thread = NULL;
 
 static int __cpuinit smp_boot_one_cpu(unsigned int cpu)
 {
-       struct trap_per_cpu *tb = &trap_block[cpu];
        unsigned long entry =
                (unsigned long)(&sparc64_cpu_startup);
        unsigned long cookie =
                (unsigned long)(&cpu_new_thread);
        struct task_struct *p;
+       void *descr = NULL;
        int timeout, ret;
 
        p = fork_idle(cpu);
@@ -359,7 +359,8 @@ static int __cpuinit smp_boot_one_cpu(unsigned int cpu)
 #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
                if (ldom_domaining_enabled)
                        ldom_startcpu_cpuid(cpu,
-                                           (unsigned long) cpu_new_thread);
+                                           (unsigned long) cpu_new_thread,
+                                           &descr);
                else
 #endif
                        prom_startcpu_cpuid(cpu, entry, cookie);
@@ -383,10 +384,7 @@ static int __cpuinit smp_boot_one_cpu(unsigned int cpu)
        }
        cpu_new_thread = NULL;
 
-       if (tb->hdesc) {
-               kfree(tb->hdesc);
-               tb->hdesc = NULL;
-       }
+       kfree(descr);
 
        return ret;
 }