Input: iqs626a - prohibit inlining of channel parsing functions

Some automated builds report a stack frame size in excess of 2 kB for
iqs626_probe(); the culprit appears to be the call to iqs626_parse_prop().

To solve this problem, specify noinline_for_stack for all of the
iqs626_parse_*() helper functions which are called inside a for loop
within iqs626_parse_prop().

As a result, a build with '-Wframe-larger-than' as low as 512 is free of
any such warnings.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20211129004104.453930-1-jeff@labundy.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/iqs626a.c b/drivers/input/misc/iqs626a.c
index d57e996732cf4d9f8ddc2b7960bc808c64a9a67b..23b5dd9552dcc0539058a17ed2a19367cbb8add4 100644 (file)
--- a/drivers/input/misc/iqs626a.c
+++ b/drivers/input/misc/iqs626a.c
@@ -456,9 +456,10 @@ struct iqs626_private {
        unsigned int suspend_mode;
 };
 
-static int iqs626_parse_events(struct iqs626_private *iqs626,
-                              const struct fwnode_handle *ch_node,
-                              enum iqs626_ch_id ch_id)
+static noinline_for_stack int
+iqs626_parse_events(struct iqs626_private *iqs626,
+                   const struct fwnode_handle *ch_node,
+                   enum iqs626_ch_id ch_id)
 {
        struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
        struct i2c_client *client = iqs626->client;
@@ -604,9 +605,10 @@ static int iqs626_parse_events(struct iqs626_private *iqs626,
        return 0;
 }
 
-static int iqs626_parse_ati_target(struct iqs626_private *iqs626,
-                                  const struct fwnode_handle *ch_node,
-                                  enum iqs626_ch_id ch_id)
+static noinline_for_stack int
+iqs626_parse_ati_target(struct iqs626_private *iqs626,
+                       const struct fwnode_handle *ch_node,
+                       enum iqs626_ch_id ch_id)
 {
        struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
        struct i2c_client *client = iqs626->client;
@@ -885,9 +887,10 @@ static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
        return 0;
 }
 
-static int iqs626_parse_channel(struct iqs626_private *iqs626,
-                               const struct fwnode_handle *ch_node,
-                               enum iqs626_ch_id ch_id)
+static noinline_for_stack int
+iqs626_parse_channel(struct iqs626_private *iqs626,
+                    const struct fwnode_handle *ch_node,
+                    enum iqs626_ch_id ch_id)
 {
        struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
        struct i2c_client *client = iqs626->client;