x86, UV: Shorten access to BAU statistics structure

Use a pointer from the per-cpu BAU control structure to the
per-cpu BAU statistics structure.
We nearly always know the first before needing the second.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004aB-2k@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 9 insertions, 8 deletions

diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 9b3e750ef2d8..6a42d42eb8f9 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -332,6 +332,7 @@ struct bau_control {
         struct bau_payload_queue_entry *bau_msg_head;
         struct bau_control *uvhub_master;
         struct bau_control *socket_master;
+        struct ptc_stats *statp;
         unsigned long timeout_interval;
         unsigned long set_bau_on_time;
         atomic_t active_descriptor_count;
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index dc6a68312758..261b9653cde5 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -153,7 +153,7 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
         struct ptc_stats *stat;
 
         msg = mdp->msg;
-        stat = &per_cpu(ptcstats, bcp->cpu);
+        stat = bcp->statp;
         stat->d_retries++;
         /*
          * cancel any message from msg+1 to the retry itself
@@ -217,7 +217,7 @@ static void uv_bau_process_message(struct msg_desc *mdp,
          * This must be a normal message, or retry of a normal message
          */
         msg = mdp->msg;
-        stat = &per_cpu(ptcstats, bcp->cpu);
+        stat = bcp->statp;
         if (msg->address == TLB_FLUSH_ALL) {
                 local_flush_tlb();
                 stat->d_alltlb++;
@@ -301,7 +301,7 @@ uv_do_reset(void *ptr)
 
         bcp = &per_cpu(bau_control, smp_processor_id());
         rap = (struct reset_args *)ptr;
-        stat = &per_cpu(ptcstats, bcp->cpu);
+        stat = bcp->statp;
         stat->d_resets++;
 
         /*
@@ -419,7 +419,7 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
         unsigned long mask;
         cycles_t ttime;
         cycles_t timeout_time;
-        struct ptc_stats *stat = &per_cpu(ptcstats, this_cpu);
+        struct ptc_stats *stat = bcp->statp;
         struct bau_control *hmaster;
 
         hmaster = bcp->uvhub_master;
@@ -583,7 +583,7 @@ const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc,
         cycles_t time1;
         cycles_t time2;
         cycles_t elapsed;
-        struct ptc_stats *stat = &per_cpu(ptcstats, bcp->cpu);
+        struct ptc_stats *stat = bcp->statp;
         struct bau_control *smaster = bcp->socket_master;
         struct bau_control *hmaster = bcp->uvhub_master;
 
@@ -794,7 +794,7 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
                 return cpumask;
 
         bcp = &per_cpu(bau_control, cpu);
-        stat = &per_cpu(ptcstats, cpu);
+        stat = bcp->statp;
 
         /* bau was disabled due to slow response */
         if (bcp->baudisabled) {
@@ -903,7 +903,7 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
 
         time_start = get_cycles();
         bcp = &per_cpu(bau_control, smp_processor_id());
-        stat = &per_cpu(ptcstats, smp_processor_id());
+        stat = bcp->statp;
         msgdesc.va_queue_first = bcp->va_queue_first;
         msgdesc.va_queue_last = bcp->va_queue_last;
         msg = bcp->bau_msg_head;
@@ -1636,6 +1636,7 @@ static void uv_init_per_cpu(int nuvhubs)
         for_each_present_cpu(cpu) {
                 bcp = &per_cpu(bau_control, cpu);
                 bcp->baudisabled = 0;
+                bcp->statp = &per_cpu(ptcstats, cpu);
                 /* time interval to catch a hardware stay-busy bug */
                 bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
                 bcp->max_bau_concurrent = max_bau_concurrent;
@@ -1673,7 +1674,6 @@ static int __init uv_bau_init(void)
                 zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
                                        GFP_KERNEL, cpu_to_node(cur_cpu));
 
-        max_bau_concurrent = MAX_BAU_CONCURRENT;
         uv_nshift = uv_hub_info->m_val;
         uv_mmask = (1UL << uv_hub_info->m_val) - 1;
         nuvhubs = uv_num_possible_blades();