thermal: add a warning for temperature emulation feature

Because this feature is for debuging purposes, it is highly
recommended to do not enable this on production systems.
This patch adds warnings for system integrators, so that
people are aware of this potential security issue.

Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 6859661c9d31..277530a5786c 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -265,6 +265,10 @@ emul_temp
         Unit: millidegree Celsius
         WO, Optional
 
+          WARNING: Be careful while enabling this option on production systems,
+          because userland can easily disable the thermal policy by simply
+          flooding this sysfs node with low temperature values.
+
 *****************************
 * Cooling device attributes *
 *****************************