1 files changed, 56 insertions, 0 deletions

diff --git a/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.23/0023-tracing-change-CPU-ring-buffer-state-from-tracing_cp.patch b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.23/0023-tracing-change-CPU-ring-buffer-state-from-tracing_cp.patch
new file mode 100644
index 00000000..eb84795a
--- /dev/null
+++ b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.23/0023-tracing-change-CPU-ring-buffer-state-from-tracing_cp.patch
@@ -0,0 +1,56 @@
+From 04098d77869c04c5bf703846783cb89b4297b2bb Mon Sep 17 00:00:00 2001
+From: Vaibhav Nagarnaik <vnagarnaik@google.com>
+Date: Thu, 3 May 2012 18:59:52 -0700
+Subject: [PATCH 23/49] tracing: change CPU ring buffer state from
+ tracing_cpumask
+
+commit 71babb2705e2203a64c27ede13ae3508a0d2c16c upstream.
+
+According to Documentation/trace/ftrace.txt:
+
+tracing_cpumask:
+
+        This is a mask that lets the user only trace
+        on specified CPUS. The format is a hex string
+        representing the CPUS.
+
+The tracing_cpumask currently doesn't affect the tracing state of
+per-CPU ring buffers.
+
+This patch enables/disables CPU recording as its corresponding bit in
+tracing_cpumask is set/unset.
+
+Link: http://lkml.kernel.org/r/1336096792-25373-3-git-send-email-vnagarnaik@google.com
+
+Cc: Frederic Weisbecker <fweisbec@gmail.com>
+Cc: Ingo Molnar <mingo@redhat.com>
+Cc: Laurent Chavey <chavey@google.com>
+Cc: Justin Teravest <teravest@google.com>
+Cc: David Sharp <dhsharp@google.com>
+Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
+Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ kernel/trace/trace.c |    2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
+index 7e4edd3..5638104 100644
+--- a/kernel/trace/trace.c
++++ b/kernel/trace/trace.c
+@@ -2541,10 +2541,12 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
+                if (cpumask_test_cpu(cpu, tracing_cpumask) &&
+                                !cpumask_test_cpu(cpu, tracing_cpumask_new)) {
+                        atomic_inc(&global_trace.data[cpu]->disabled);
++                       ring_buffer_record_disable_cpu(global_trace.buffer, cpu);
+                }
+                if (!cpumask_test_cpu(cpu, tracing_cpumask) &&
+                                cpumask_test_cpu(cpu, tracing_cpumask_new)) {
+                        atomic_dec(&global_trace.data[cpu]->disabled);
++                       ring_buffer_record_enable_cpu(global_trace.buffer, cpu);
+                }
+        }
+        arch_spin_unlock(&ftrace_max_lock);
+-- 
+1.7.10
+