ACPI: thinkpad-acpi: use bitfields to hold subdriver flags

Save some memory by using bitfields to hold boolean flags for the
subdrivers.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 23 insertions, 22 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index cddf81bb2d97..a5efd06523dd 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -339,7 +339,7 @@ static int __init setup_notify(struct ibm_struct *ibm)
                 }
                 return -ENODEV;
         }
-        ibm->notify_installed = 1;
+        ibm->flags.notify_installed = 1;
         return 0;
 }
 
@@ -372,7 +372,7 @@ static int __init register_tpacpi_subdriver(struct ibm_struct *ibm)
                 kfree(ibm->driver);
                 ibm->driver = NULL;
         } else if (!ret)
-                ibm->driver_registered = 1;
+                ibm->flags.driver_registered = 1;
 
         return ret;
 }
@@ -815,7 +815,7 @@ static struct ibm_struct wan_driver_data = {
         .name = "wan",
         .read = wan_read,
         .write = wan_write,
-        .experimental = 1,
+        .flags.experimental = 1,
 };
 
 /*************************************************************************
@@ -1851,7 +1851,7 @@ static struct ibm_struct ecdump_driver_data = {
         .name = "ecdump",
         .read = ecdump_read,
         .write = ecdump_write,
-        .experimental = 1,
+        .flags.experimental = 1,
 };
 
 /*************************************************************************
@@ -2684,7 +2684,7 @@ static struct ibm_struct fan_driver_data = {
         .read = fan_read,
         .write = fan_write,
         .exit = fan_exit,
-        .experimental = 1,
+        .flags.experimental = 1,
 };
 
 /****************************************************************************
@@ -2725,7 +2725,7 @@ static int __init ibm_init(struct ibm_init_struct *iibm)
 
         INIT_LIST_HEAD(&ibm->all_drivers);
 
-        if (ibm->experimental && !experimental)
+        if (ibm->flags.experimental && !experimental)
                 return 0;
 
         dbg_printk(TPACPI_DBG_INIT,
@@ -2738,7 +2738,7 @@ static int __init ibm_init(struct ibm_init_struct *iibm)
                 if (ret)
                         return ret;
 
-                ibm->init_called = 1;
+                ibm->flags.init_called = 1;
         }
 
         if (ibm->hid) {
@@ -2777,7 +2777,7 @@ static int __init ibm_init(struct ibm_init_struct *iibm)
                 entry->read_proc = &dispatch_read;
                 if (ibm->write)
                         entry->write_proc = &dispatch_write;
-                ibm->proc_created = 1;
+                ibm->flags.proc_created = 1;
         }
 
         list_add_tail(&ibm->all_drivers, &tpacpi_all_drivers);
@@ -2799,33 +2799,33 @@ static void ibm_exit(struct ibm_struct *ibm)
 
         list_del_init(&ibm->all_drivers);
 
-        if (ibm->notify_installed) {
+        if (ibm->flags.notify_installed) {
                 dbg_printk(TPACPI_DBG_EXIT,
                         "%s: acpi_remove_notify_handler\n", ibm->name);
                 acpi_remove_notify_handler(*ibm->handle, ibm->type,
                                            dispatch_notify);
-                ibm->notify_installed = 0;
+                ibm->flags.notify_installed = 0;
         }
 
-        if (ibm->proc_created) {
+        if (ibm->flags.proc_created) {
                 dbg_printk(TPACPI_DBG_EXIT,
                         "%s: remove_proc_entry\n", ibm->name);
                 remove_proc_entry(ibm->name, proc_dir);
-                ibm->proc_created = 0;
+                ibm->flags.proc_created = 0;
         }
 
-        if (ibm->driver_registered) {
+        if (ibm->flags.driver_registered) {
                 dbg_printk(TPACPI_DBG_EXIT,
                         "%s: acpi_bus_unregister_driver\n", ibm->name);
                 acpi_bus_unregister_driver(ibm->driver);
                 kfree(ibm->driver);
                 ibm->driver = NULL;
-                ibm->driver_registered = 0;
+                ibm->flags.driver_registered = 0;
         }
 
-        if (ibm->init_called && ibm->exit) {
+        if (ibm->flags.init_called && ibm->exit) {
                 ibm->exit();
-                ibm->init_called = 0;
+                ibm->flags.init_called = 0;
         }
 
         dbg_printk(TPACPI_DBG_INIT, "finished removing %s\n", ibm->name);
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index 20203981cb7a..8b72061d8f0e 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -157,12 +157,13 @@ struct ibm_struct {
 
         struct list_head all_drivers;
 
-        int driver_registered;
-        int proc_created;
-        int init_called;
-        int notify_installed;
-
-        int experimental;
+        struct {
+                u8 driver_registered:1;
+                u8 proc_created:1;
+                u8 init_called:1;
+                u8 notify_installed:1;
+                u8 experimental:1;
+        } flags;
 };
 
 struct ibm_init_struct {