The Altera EDAC driver has several features conditionally built
depending on Kconfig options.  The edac_device_prv_data structures are
conditionally used in of_device_id tables.  They reference other
functions and structures which can be defined as __maybe_unused.  This
silences build warnings like:

     drivers/edac/altera_edac.c:643:37: warning:
         ‘altr_edac_device_inject_fops’ defined but not used [-Wunused-const-variable=]

Reported-by: kernel test robot <redacted>
Signed-off-by: Krzysztof Kozlowski <redacted>
---
  drivers/edac/altera_edac.c | 44 ++++++++++++++++++++++----------------
  1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 61c21bd880a4..2949edb93454 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c

@@ -539,10 +539,18 @@ module_platform_driver(altr_edac_driver);
   * trigger testing are different for each memory.
   */
  
+#ifdef CONFIG_EDAC_ALTERA_OCRAM
  static const struct edac_device_prv_data ocramecc_data;
+#endif
+#ifdef CONFIG_EDAC_ALTERA_L2C
  static const struct edac_device_prv_data l2ecc_data;
+#endif
+#ifdef CONFIG_EDAC_ALTERA_OCRAM
  static const struct edac_device_prv_data a10_ocramecc_data;
+#endif
+#ifdef CONFIG_EDAC_ALTERA_L2C
  static const struct edac_device_prv_data a10_l2ecc_data;
+#endif
  
  static irqreturn_t altr_edac_device_handler(int irq, void *dev_id)
  {

@@ -569,9 +577,9 @@ static irqreturn_t altr_edac_device_handler(int irq, void *dev_id)
  	return ret_value;
  }
  
-static ssize_t altr_edac_device_trig(struct file *file,
-				     const char __user *user_buf,
-				     size_t count, loff_t *ppos)
+static ssize_t __maybe_unused
+altr_edac_device_trig(struct file *file, const char __user *user_buf,
+		      size_t count, loff_t *ppos)
  
  {
  	u32 *ptemp, i, error_mask;

@@ -640,27 +648,27 @@ static ssize_t altr_edac_device_trig(struct file *file,
  	return count;
  }
  
-static const struct file_operations altr_edac_device_inject_fops = {
+static const struct file_operations altr_edac_device_inject_fops __maybe_unused = {
  	.open = simple_open,
  	.write = altr_edac_device_trig,
  	.llseek = generic_file_llseek,
  };
  
-static ssize_t altr_edac_a10_device_trig(struct file *file,
-					 const char __user *user_buf,
-					 size_t count, loff_t *ppos);
+static ssize_t __maybe_unused
+altr_edac_a10_device_trig(struct file *file, const char __user *user_buf,
+			  size_t count, loff_t *ppos);
  
-static const struct file_operations altr_edac_a10_device_inject_fops = {
+static const struct file_operations altr_edac_a10_device_inject_fops __maybe_unused = {
  	.open = simple_open,
  	.write = altr_edac_a10_device_trig,
  	.llseek = generic_file_llseek,
  };
  
-static ssize_t altr_edac_a10_device_trig2(struct file *file,
-					  const char __user *user_buf,
-					  size_t count, loff_t *ppos);
+static ssize_t __maybe_unused
+altr_edac_a10_device_trig2(struct file *file, const char __user *user_buf,
+			   size_t count, loff_t *ppos);
  
-static const struct file_operations altr_edac_a10_device_inject2_fops = {
+static const struct file_operations altr_edac_a10_device_inject2_fops __maybe_unused = {
  	.open = simple_open,
  	.write = altr_edac_a10_device_trig2,
  	.llseek = generic_file_llseek,

@@ -1697,9 +1705,9 @@ MODULE_DEVICE_TABLE(of, altr_edac_a10_device_of_match);
   * Based on xgene_edac.c peripheral code.
   */
  
-static ssize_t altr_edac_a10_device_trig(struct file *file,
-					 const char __user *user_buf,
-					 size_t count, loff_t *ppos)
+static ssize_t __maybe_unused
+altr_edac_a10_device_trig(struct file *file, const char __user *user_buf,
+			  size_t count, loff_t *ppos)
  {
  	struct edac_device_ctl_info *edac_dci = file->private_data;
  	struct altr_edac_device_dev *drvdata = edac_dci->pvt_info;

@@ -1729,9 +1737,9 @@ static ssize_t altr_edac_a10_device_trig(struct file *file,
   * slightly. A few Arria10 peripherals can use this injection function.
   * Inject the error into the memory and then readback to trigger the IRQ.
   */
-static ssize_t altr_edac_a10_device_trig2(struct file *file,
-					  const char __user *user_buf,
-					  size_t count, loff_t *ppos)
+static ssize_t __maybe_unused
+altr_edac_a10_device_trig2(struct file *file, const char __user *user_buf,
+			   size_t count, loff_t *ppos)
  {
  	struct edac_device_ctl_info *edac_dci = file->private_data;
  	struct altr_edac_device_dev *drvdata = edac_dci->pvt_info;