Revert "perf: Disable PERF_RECORD_MMAP2 support"

This reverts commit 3090ffb5a2515990182f3f55b0688a7817325488.

Re-enable the mmap2 interface as we will have a user soon.

Since things have changed since perf disabled mmap2, small tweaks
to the revert had to be done:

o commit 9d4ecc88 forced (n!=8) to become (n<7)
o a new libunwind test needed updating to use mmap2 interface

Signed-off-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/1401461382-209586-1-git-send-email-dzickus@redhat.com
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index eea1955c7868..cd28335b3d28 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6929,10 +6929,6 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
         if (ret)
                 return -EFAULT;
 
-        /* disabled for now */
-        if (attr->mmap2)
-                return -EINVAL;
-
         if (attr->__reserved_1)
                 return -EINVAL;