[PATCH] efi: sysfb_efi: guard EFI-specific code with CONFIG_EFI

[Yu-Chun Lin]

As reported by the kernel test robot, the following warnings occur:

>> drivers/firmware/efi/sysfb_efi.c:331:39: warning: 'efifb_fwnode_ops' defined but not used [-Wunused-const-variable=]
     331 | static const struct fwnode_operations efifb_fwnode_ops = {
         |                                       ^~~~~~~~~~~~~~~~
>> drivers/firmware/efi/sysfb_efi.c:240:35: warning: 'efifb_dmi_swap_width_height' defined but not used [-Wunused-const-variable=]
     240 | static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
         |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/firmware/efi/sysfb_efi.c:190:35: warning: 'efifb_dmi_system_table' defined but not used [-Wunused-const-variable=]
     190 | static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
         |                                   ^~~~~~~~~~~~~~~~~~~~~~

Unused variables, functions, and macro are conditionally compiled under
CONFIG_EFI. This includes 'efifb_fwnode_ops',
'efifb_dmi_swap_width_height[]', 'efifb_dmi_system_table[]',
'efifb_add_links', 'find_pci_overlap_node','efifb_set_system',
'efifb_overlaps_pci_range', and the 'EFIFB_DMI_SYSTEM_ID' macro.

Suppress unused symbol warnings and ensure inclusion only in relevant
configurations.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202501051626.SMkizYIE-lkp@xxxxxxxxx/
Signed-off-by: Yu-Chun Lin <eleanor15x@xxxxxxxxx>
---
 drivers/firmware/efi/sysfb_efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/sysfb_efi.c b/drivers/firmware/efi/sysfb_efi.c
index cc807ed35aed..4efe383cc470 100644
--- a/drivers/firmware/efi/sysfb_efi.c
+++ b/drivers/firmware/efi/sysfb_efi.c
@@ -174,6 +174,7 @@ static int __init efifb_set_system(const struct dmi_system_id *id)
 	return 1;
 }
 
+#ifdef CONFIG_EFI
 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
 	{							\
 		efifb_set_system,				\
@@ -346,7 +347,6 @@ static const struct fwnode_operations efifb_fwnode_ops = {
 	.add_links = efifb_add_links,
 };
 
-#ifdef CONFIG_EFI
 static struct fwnode_handle efifb_fwnode;
 
 __init void sysfb_apply_efi_quirks(void)
-- 
2.43.0