Merge tag 'exynos-cpuidle' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/soc

Merge "Samsung exynos cpuidle update for v3.17" from Kukjin Kim:

- add callbacks exynos_suspend() and exynos_powered_up()
  for support cpuidle through mcpm
- skip exynos_cpuidle for exynos5420 because is uses
  cpuidle-big-liggle generic cpuidle driver
- add generic functions to calculate cpu number is used
  for pmu and this is required for exynos5420 multi-cluster
- add of_device_id structure for big.LITTLE cpuidle and
  add "samsung,exynos5420" compatible string for exynos5420

* tag 'exynos-cpuidle' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: EXYNOS: populate suspend and powered_up callbacks for mcpm
  ARM: EXYNOS: do not allow cpuidle registration for exynos5420
  cpuidle: big.LITTLE: init driver for exynos5420
  cpuidle: big.LITTLE: Add ARCH_EXYNOS entry in config
  ARM: EXYNOS: add generic function to calculate cpu number
  cpuidle: big.LITTLE: add of_device_id structure
  + Linux 3.16-rc5

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 27 insertions, 19 deletions

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 04fdb5de823c..3c9b97e6b1f4 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -893,6 +893,9 @@ probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
         int ret;
 
         if (file) {
+                if (tu->tp.flags & TP_FLAG_PROFILE)
+                        return -EINTR;
+
                 link = kmalloc(sizeof(*link), GFP_KERNEL);
                 if (!link)
                         return -ENOMEM;
@@ -901,29 +904,40 @@ probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
                 list_add_tail_rcu(&link->list, &tu->tp.files);
 
                 tu->tp.flags |= TP_FLAG_TRACE;
-        } else
-                tu->tp.flags |= TP_FLAG_PROFILE;
+        } else {
+                if (tu->tp.flags & TP_FLAG_TRACE)
+                        return -EINTR;
 
-        ret = uprobe_buffer_enable();
-        if (ret < 0)
-                return ret;
+                tu->tp.flags |= TP_FLAG_PROFILE;
+        }
 
         WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
         if (enabled)
                 return 0;
 
+        ret = uprobe_buffer_enable();
+        if (ret)
+                goto err_flags;
+
         tu->consumer.filter = filter;
         ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
-        if (ret) {
-                if (file) {
-                        list_del(&link->list);
-                        kfree(link);
-                        tu->tp.flags &= ~TP_FLAG_TRACE;
-                } else
-                        tu->tp.flags &= ~TP_FLAG_PROFILE;
-        }
+        if (ret)
+                goto err_buffer;
 
+        return 0;
+
+ err_buffer:
+        uprobe_buffer_disable();
+
+ err_flags:
+        if (file) {
+                list_del(&link->list);
+                kfree(link);
+                tu->tp.flags &= ~TP_FLAG_TRACE;
+        } else {
+                tu->tp.flags &= ~TP_FLAG_PROFILE;
+        }
         return ret;
 }
 
@@ -1201,12 +1215,6 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
 
         current->utask->vaddr = (unsigned long) &udd;
 
-#ifdef CONFIG_PERF_EVENTS
-        if ((tu->tp.flags & TP_FLAG_TRACE) == 0 &&
-            !uprobe_perf_filter(&tu->consumer, 0, current->mm))
-                return UPROBE_HANDLER_REMOVE;
-#endif
-
         if (WARN_ON_ONCE(!uprobe_cpu_buffer))
                 return 0;