[PATCH] fbdev: sm712fb: avoid unused function warnings

From: Arnd Bergmann
Date: Fri Nov 20 2015 - 16:51:51 EST

The sm712fb framebuffer driver encloses the power-management
functions in #ifdef CONFIG_PM, but the smtcfb_pci_suspend/resume
functions are only really used when CONFIG_PM_SLEEP is also
set, as a frequent gcc warning shows:

fbdev/sm712fb.c:1549:12: warning: 'smtcfb_pci_suspend' defined but not used
fbdev/sm712fb.c:1572:12: warning: 'smtcfb_pci_resume' defined but not used

The driver also avoids using the SIMPLE_DEV_PM_OPS macro when
CONFIG_PM is unset, which is redundant.

This changes the driver to remove the #ifdef and instead mark
the functions as __maybe_unused, which is a nicer anyway, as it
provides build testing for all the code in all configurations
and is harder to get wrong.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 629bfa2d2f51..86ae1d4556fc 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -28,9 +28,7 @@
#include <linux/console.h>
#include <linux/screen_info.h>

-#ifdef CONFIG_PM
#include <linux/pm.h>

#include "sm712.h"

@@ -1545,8 +1543,7 @@ static void smtcfb_pci_remove(struct pci_dev *pdev)

-#ifdef CONFIG_PM
-static int smtcfb_pci_suspend(struct device *device)
+static int __maybe_unused smtcfb_pci_suspend(struct device *device)
struct pci_dev *pdev = to_pci_dev(device);
struct smtcfb_info *sfb;
@@ -1569,7 +1566,7 @@ static int smtcfb_pci_suspend(struct device *device)
return 0;

-static int smtcfb_pci_resume(struct device *device)
+static int __maybe_unused smtcfb_pci_resume(struct device *device)
struct pci_dev *pdev = to_pci_dev(device);
struct smtcfb_info *sfb;
@@ -1610,20 +1607,13 @@ static int smtcfb_pci_resume(struct device *device)

static SIMPLE_DEV_PM_OPS(sm7xx_pm_ops, smtcfb_pci_suspend, smtcfb_pci_resume);
-#define SM7XX_PM_OPS (&sm7xx_pm_ops)
-#else /* !CONFIG_PM */
-#define SM7XX_PM_OPS NULL
-#endif /* !CONFIG_PM */

static struct pci_driver smtcfb_driver = {
.name = "smtcfb",
.id_table = smtcfb_pci_table,
.probe = smtcfb_pci_probe,
.remove = smtcfb_pci_remove,
- .driver.pm = SM7XX_PM_OPS,
+ .driver.pm = &sm7xx_pm_ops,

static int __init sm712fb_init(void)

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