sparc64: Kill off old sys_perfctr system call and state.

People should be using the perf events interfaces, and
the way these system call facilities used the %pcr conflicts
with the usage of the NMI watchdog and perf events.

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

1 files changed, 0 insertions, 23 deletions

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index cb70476bd8f5..a5cf3864b31f 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -352,12 +352,6 @@ void exit_thread(void)
                 else
                         t->utraps[0]--;
         }
-
-        if (test_and_clear_thread_flag(TIF_PERFCTR)) {
-                t->user_cntd0 = t->user_cntd1 = NULL;
-                t->pcr_reg = 0;
-                write_pcr(0);
-        }
 }
 
 void flush_thread(void)
@@ -371,13 +365,6 @@ void flush_thread(void)
 
         set_thread_wsaved(0);
 
-        /* Turn off performance counters if on. */
-        if (test_and_clear_thread_flag(TIF_PERFCTR)) {
-                t->user_cntd0 = t->user_cntd1 = NULL;
-                t->pcr_reg = 0;
-                write_pcr(0);
-        }
-
         /* Clear FPU register state. */
         t->fpsaved[0] = 0;
         
@@ -591,16 +578,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
                 t->kregs->u_regs[UREG_FP] =
                   ((unsigned long) child_sf) - STACK_BIAS;
 
-                /* Special case, if we are spawning a kernel thread from
-                 * a userspace task (usermode helper, NFS or similar), we
-                 * must disable performance counters in the child because
-                 * the address space and protection realm are changing.
-                 */
-                if (t->flags & _TIF_PERFCTR) {
-                        t->user_cntd0 = t->user_cntd1 = NULL;
-                        t->pcr_reg = 0;
-                        t->flags &= ~_TIF_PERFCTR;
-                }
                 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
                 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
                 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;