linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / arch / ia64 / sn / kernel / sn2 / sn2_smp.c

diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index d9d306c..b2e1e74 100644 (file)
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -93,27 +93,6 @@ static inline unsigned long wait_piowc(void)
        return (ws & SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_MASK) != 0;
 }
 
-/**
- * sn_migrate - SN-specific task migration actions
- * @task: Task being migrated to new CPU
- *
- * SN2 PIO writes from separate CPUs are not guaranteed to arrive in order.
- * Context switching user threads which have memory-mapped MMIO may cause
- * PIOs to issue from seperate CPUs, thus the PIO writes must be drained
- * from the previous CPU's Shub before execution resumes on the new CPU.
- */
-void sn_migrate(struct task_struct *task)
-{
-       pda_t *last_pda = pdacpu(task_thread_info(task)->last_cpu);
-       volatile unsigned long *adr = last_pda->pio_write_status_addr;
-       unsigned long val = last_pda->pio_write_status_val;
-
-       /* Drain PIO writes from old CPU's Shub */
-       while (unlikely((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK)
-                       != val))
-               cpu_relax();
-}
-
 void sn_tlb_migrate_finish(struct mm_struct *mm)
 {
        /* flush_tlb_mm is inefficient if more than 1 users of mm */