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authorDavid Brownell <david-b@pacbell.net>2006-11-16 23:28:47 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-01 14:52:02 -0800
commitc67334fbdfbba533af767610cf3fde8a49710e62 (patch)
treec386f3aa4af94bb7d24ddb18b51f90bcb9a4d599 /include/linux
parentacf02d23b96efa92e7cff05987122ceeb37dd075 (diff)
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Driver core: platform_driver_probe(), can save codespace
This defines a new platform_driver_probe() method allowing the driver's probe() method, and its support code+data, to safely live in __init sections for typical system configurations. Many system-on-chip processors could benefit from this API, to the tune of recovering hundreds to thousands of bytes per driver. That's memory which is currently wasted holding code which can never be called after system startup, yet can not be removed. It can't be removed because of the linkage requirement that pointers to init section code (like, ideally, probe support) must not live in other sections (like driver method tables) after those pointers would be invalid. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/platform_device.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 29cd6de..20f47b8 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -58,6 +58,12 @@ struct platform_driver {
extern int platform_driver_register(struct platform_driver *);
extern void platform_driver_unregister(struct platform_driver *);
+/* non-hotpluggable platform devices may use this so that probe() and
+ * its support may live in __init sections, conserving runtime memory.
+ */
+extern int platform_driver_probe(struct platform_driver *driver,
+ int (*probe)(struct platform_device *));
+
#define platform_get_drvdata(_dev) dev_get_drvdata(&(_dev)->dev)
#define platform_set_drvdata(_dev,data) dev_set_drvdata(&(_dev)->dev, (data))