x86, perf, bts, mm: Delete the never used BTS-ptrace code

Support for the PMU's BTS features has been upstreamed in
v2.6.32, but we still have the old and disabled ptrace-BTS,
as Linus noticed it not so long ago.

It's buggy: TIF_DEBUGCTLMSR is trampling all over that MSR without
regard for other uses (perf) and doesn't provide the flexibility
needed for perf either.

Its users are ptrace-block-step and ptrace-bts, since ptrace-bts
was never used and ptrace-block-step can be implemented using a
much simpler approach.

So axe all 3000 lines of it. That includes the *locked_memory*()
APIs in mm/mlock.c as well.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Markus Metzger <markus.t.metzger@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20100325135413.938004390@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 57 deletions

diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 280fea470d6..a7084e7c042 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -16,7 +16,6 @@ static inline int trace_valid_entry(struct trace_entry *entry)
         case TRACE_BRANCH:
         case TRACE_GRAPH_ENT:
         case TRACE_GRAPH_RET:
-        case TRACE_HW_BRANCHES:
         case TRACE_KSYM:
                 return 1;
         }
@@ -754,62 +753,6 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
 }
 #endif /* CONFIG_BRANCH_TRACER */
 
-#ifdef CONFIG_HW_BRANCH_TRACER
-int
-trace_selftest_startup_hw_branches(struct tracer *trace,
-                                   struct trace_array *tr)
-{
-        struct trace_iterator *iter;
-        struct tracer tracer;
-        unsigned long count;
-        int ret;
-
-        if (!trace->open) {
-                printk(KERN_CONT "missing open function...");
-                return -1;
-        }
-
-        ret = tracer_init(trace, tr);
-        if (ret) {
-                warn_failed_init_tracer(trace, ret);
-                return ret;
-        }
-
-        /*
-         * The hw-branch tracer needs to collect the trace from the various
-         * cpu trace buffers - before tracing is stopped.
-         */
-        iter = kzalloc(sizeof(*iter), GFP_KERNEL);
-        if (!iter)
-                return -ENOMEM;
-
-        memcpy(&tracer, trace, sizeof(tracer));
-
-        iter->trace = &tracer;
-        iter->tr = tr;
-        iter->pos = -1;
-        mutex_init(&iter->mutex);
-
-        trace->open(iter);
-
-        mutex_destroy(&iter->mutex);
-        kfree(iter);
-
-        tracing_stop();
-
-        ret = trace_test_buffer(tr, &count);
-        trace->reset(tr);
-        tracing_start();
-
-        if (!ret && !count) {
-                printk(KERN_CONT "no entries found..");
-                ret = -1;
-        }
-
-        return ret;
-}
-#endif /* CONFIG_HW_BRANCH_TRACER */
-
 #ifdef CONFIG_KSYM_TRACER
 static int ksym_selftest_dummy;