[04/30] usb: misc: sisusbvga: sisusb_init: Mark all 'static const' arrays as __maybe_unused
diff mbox series

Message ID 20200703174148.2749969-5-lee.jones@linaro.org
State New
Headers show
Series
  • Fix a bunch more W=1 issues in USB
Related show

Commit Message

Lee Jones July 3, 2020, 5:41 p.m. UTC
drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
source files.  Most of which do not use the majority of the
shared static const arrays which have been declared.  This
causes the build system to spew 100's of warnings.

Fixes the following W=1 kernel build warning(s) - and a whole lot more:

 In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
 drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
 695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
 | ^~~~~~~~~~~~~~~
[10's of lines snipped]
 drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
 206 | static const unsigned char SiS_VGA_DAC[] = {
 | ^~~~~~~~~~~
[10's of lines snipped]
 drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
 171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
 | ^~~~~~~~~~~~~~~~~~~
[10's of lines snipped]

Cc: Thomas Winischhofer <thomas@winischhofer.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/usb/misc/sisusbvga/sisusb_init.h | 66 ++++++++++++------------
 1 file changed, 33 insertions(+), 33 deletions(-)

Comments

Joe Perches July 3, 2020, 6:29 p.m. UTC | #1
On Fri, 2020-07-03 at 18:41 +0100, Lee Jones wrote:
> drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> source files.  Most of which do not use the majority of the
> shared static const arrays which have been declared.  This
> causes the build system to spew 100's of warnings.
> 
> Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> 
>  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
>  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
>  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
>  | ^~~~~~~~~~~~~~~
> [10's of lines snipped]
>  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
>  206 | static const unsigned char SiS_VGA_DAC[] = {
>  | ^~~~~~~~~~~
> [10's of lines snipped]
>  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
>  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
>  | ^~~~~~~~~~~~~~~~~~~
> [10's of lines snipped]

They are not __maybe_unused, they _are_ used.

I think these instead should be moved to where
they are used instead of being declared in an
#include file.
Lee Jones July 3, 2020, 7:44 p.m. UTC | #2
On Fri, 03 Jul 2020, Joe Perches wrote:

> On Fri, 2020-07-03 at 18:41 +0100, Lee Jones wrote:
> > drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> > source files.  Most of which do not use the majority of the
> > shared static const arrays which have been declared.  This
> > causes the build system to spew 100's of warnings.
> > 
> > Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> > 
> >  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
> >  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
> >  | ^~~~~~~~~~~~~~~
> > [10's of lines snipped]
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
> >  206 | static const unsigned char SiS_VGA_DAC[] = {
> >  | ^~~~~~~~~~~
> > [10's of lines snipped]
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
> >  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
> >  | ^~~~~~~~~~~~~~~~~~~
> > [10's of lines snipped]
> 
> They are not __maybe_unused, they _are_ used.

Potentially not by every consumer of this header file.

> I think these instead should be moved to where
> they are used instead of being declared in an
> #include file.

That works if they are being used by only one source file.

I'll look into it for this instance and get back to you.
Lee Jones July 7, 2020, 7:49 a.m. UTC | #3
On Fri, 03 Jul 2020, Lee Jones wrote:

> drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> source files.  Most of which do not use the majority of the
> shared static const arrays which have been declared.  This
> causes the build system to spew 100's of warnings.
> 
> Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> 
>  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
>  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
>  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
>  | ^~~~~~~~~~~~~~~
> [10's of lines snipped]
>  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
>  206 | static const unsigned char SiS_VGA_DAC[] = {
>  | ^~~~~~~~~~~
> [10's of lines snipped]
>  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
>  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
>  | ^~~~~~~~~~~~~~~~~~~
> [10's of lines snipped]
> 
> Cc: Thomas Winischhofer <thomas@winischhofer.net>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>  drivers/usb/misc/sisusbvga/sisusb_init.h | 66 ++++++++++++------------
>  1 file changed, 33 insertions(+), 33 deletions(-)

Greg,

Please drop this patch.  I have a new solution.
Lee Jones July 7, 2020, 8:03 a.m. UTC | #4
On Fri, 03 Jul 2020, Joe Perches wrote:

> On Fri, 2020-07-03 at 18:41 +0100, Lee Jones wrote:
> > drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> > source files.  Most of which do not use the majority of the
> > shared static const arrays which have been declared.  This
> > causes the build system to spew 100's of warnings.
> > 
> > Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> > 
> >  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
> >  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
> >  | ^~~~~~~~~~~~~~~
> > [10's of lines snipped]
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
> >  206 | static const unsigned char SiS_VGA_DAC[] = {
> >  | ^~~~~~~~~~~
> > [10's of lines snipped]
> >  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
> >  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
> >  | ^~~~~~~~~~~~~~~~~~~
> > [10's of lines snipped]
> 
> They are not __maybe_unused, they _are_ used.

Actually, it looks like all of the ModeIndex_* table are *not* used,
so those will be removed.

> I think these instead should be moved to where
> they are used instead of being declared in an
> #include file.

The remaining tables are many and large, so stuffing them into the
source file does not seem like the correct thing to do.  Instead I
shall move them to their own "sisusb_tables.h" include file where they
can be referenced only by the file(s) which make use of them.
Joe Perches July 7, 2020, 8:50 p.m. UTC | #5
On Tue, 2020-07-07 at 09:03 +0100, Lee Jones wrote:
> On Fri, 03 Jul 2020, Joe Perches wrote:
> 
> > On Fri, 2020-07-03 at 18:41 +0100, Lee Jones wrote:
> > > drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> > > source files.  Most of which do not use the majority of the
> > > shared static const arrays which have been declared.  This
> > > causes the build system to spew 100's of warnings.
> > > 
> > > Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> > > 
> > >  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
> > >  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
> > >  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
> > >  | ^~~~~~~~~~~~~~~
> > > [10's of lines snipped]
> > >  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
> > >  206 | static const unsigned char SiS_VGA_DAC[] = {
> > >  | ^~~~~~~~~~~
> > > [10's of lines snipped]
> > >  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
> > >  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
> > >  | ^~~~~~~~~~~~~~~~~~~
> > > [10's of lines snipped]
> > 
> > They are not __maybe_unused, they _are_ used.
> 
> Actually, it looks like all of the ModeIndex_* table are *not* used,
> so those will be removed.
> 
> > I think these instead should be moved to where
> > they are used instead of being declared in an
> > #include file.
> 
> The remaining tables are many and large, so stuffing them into the
> source file does not seem like the correct thing to do.

It the right thing to do is because otherwise they
would be duplicated.  Either declare them only in
the single file where use or declare them extern
and define them only in one place.
Lee Jones July 8, 2020, 6:34 a.m. UTC | #6
On Tue, 07 Jul 2020, Joe Perches wrote:

> On Tue, 2020-07-07 at 09:03 +0100, Lee Jones wrote:
> > On Fri, 03 Jul 2020, Joe Perches wrote:
> > 
> > > On Fri, 2020-07-03 at 18:41 +0100, Lee Jones wrote:
> > > > drivers/usb/misc/sisusbvga/sisusb_init.h is included by a few
> > > > source files.  Most of which do not use the majority of the
> > > > shared static const arrays which have been declared.  This
> > > > causes the build system to spew 100's of warnings.
> > > > 
> > > > Fixes the following W=1 kernel build warning(s) - and a whole lot more:
> > > > 
> > > >  In file included from drivers/usb/misc/sisusbvga/sisusb.c:54:
> > > >  drivers/usb/misc/sisusbvga/sisusb_init.h:695:34: warning: ‘SiSUSB_VCLKData’ defined but not used [-Wunused-const-variable=]
> > > >  695 | static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
> > > >  | ^~~~~~~~~~~~~~~
> > > > [10's of lines snipped]
> > > >  drivers/usb/misc/sisusbvga/sisusb_init.h:206:28: warning: ‘SiS_VGA_DAC’ defined but not used [-Wunused-const-variable=]
> > > >  206 | static const unsigned char SiS_VGA_DAC[] = {
> > > >  | ^~~~~~~~~~~
> > > > [10's of lines snipped]
> > > >  drivers/usb/misc/sisusbvga/sisusb_init.h:171:29: warning: ‘ModeIndex_1280x1024’ defined but not used [-Wunused-const-variable=]
> > > >  171 | static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
> > > >  | ^~~~~~~~~~~~~~~~~~~
> > > > [10's of lines snipped]
> > > 
> > > They are not __maybe_unused, they _are_ used.
> > 
> > Actually, it looks like all of the ModeIndex_* table are *not* used,
> > so those will be removed.
> > 
> > > I think these instead should be moved to where
> > > they are used instead of being declared in an
> > > #include file.
> > 
> > The remaining tables are many and large, so stuffing them into the
> > source file does not seem like the correct thing to do.
> 
> It the right thing to do is because otherwise they
> would be duplicated.  Either declare them only in
> the single file where use or declare them extern
> and define them only in one place.

I refuse to dump 700 lines of nonsensical cruft (data) into a
source file.  No one wants to parse through that in any C file they
maintain/operate on.

Not sure I understand why they would be duplicated.  The *-tables.h
header file will only be included by the 1 source file that makes use
of them.  Could you please elaborate?

Patch
diff mbox series

diff --git a/drivers/usb/misc/sisusbvga/sisusb_init.h b/drivers/usb/misc/sisusbvga/sisusb_init.h
index aa33bc81ee526..927956d33e4d1 100644
--- a/drivers/usb/misc/sisusbvga/sisusb_init.h
+++ b/drivers/usb/misc/sisusbvga/sisusb_init.h
@@ -148,29 +148,29 @@ 
 #define SIS_CRT2_PORT_04	0x04 - 0x30
 
 /* Mode numbers */
-static const unsigned short ModeIndex_320x200[] = { 0x59, 0x41, 0x00, 0x4f };
-static const unsigned short ModeIndex_320x240[] = { 0x50, 0x56, 0x00, 0x53 };
-static const unsigned short ModeIndex_400x300[] = { 0x51, 0x57, 0x00, 0x54 };
-static const unsigned short ModeIndex_512x384[] = { 0x52, 0x58, 0x00, 0x5c };
-static const unsigned short ModeIndex_640x400[] = { 0x2f, 0x5d, 0x00, 0x5e };
-static const unsigned short ModeIndex_640x480[] = { 0x2e, 0x44, 0x00, 0x62 };
-static const unsigned short ModeIndex_720x480[] = { 0x31, 0x33, 0x00, 0x35 };
-static const unsigned short ModeIndex_720x576[] = { 0x32, 0x34, 0x00, 0x36 };
-static const unsigned short ModeIndex_768x576[] = { 0x5f, 0x60, 0x00, 0x61 };
-static const unsigned short ModeIndex_800x480[] = { 0x70, 0x7a, 0x00, 0x76 };
-static const unsigned short ModeIndex_800x600[] = { 0x30, 0x47, 0x00, 0x63 };
-static const unsigned short ModeIndex_848x480[] = { 0x39, 0x3b, 0x00, 0x3e };
-static const unsigned short ModeIndex_856x480[] = { 0x3f, 0x42, 0x00, 0x45 };
-static const unsigned short ModeIndex_960x540[] = { 0x1d, 0x1e, 0x00, 0x1f };
-static const unsigned short ModeIndex_960x600[] = { 0x20, 0x21, 0x00, 0x22 };
-static const unsigned short ModeIndex_1024x768[] = { 0x38, 0x4a, 0x00, 0x64 };
-static const unsigned short ModeIndex_1024x576[] = { 0x71, 0x74, 0x00, 0x77 };
-static const unsigned short ModeIndex_1152x864[] = { 0x29, 0x2a, 0x00, 0x2b };
-static const unsigned short ModeIndex_1280x720[] = { 0x79, 0x75, 0x00, 0x78 };
-static const unsigned short ModeIndex_1280x768[] = { 0x23, 0x24, 0x00, 0x25 };
-static const unsigned short ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
+static const unsigned short __maybe_unused ModeIndex_320x200[] = { 0x59, 0x41, 0x00, 0x4f };
+static const unsigned short __maybe_unused ModeIndex_320x240[] = { 0x50, 0x56, 0x00, 0x53 };
+static const unsigned short __maybe_unused ModeIndex_400x300[] = { 0x51, 0x57, 0x00, 0x54 };
+static const unsigned short __maybe_unused ModeIndex_512x384[] = { 0x52, 0x58, 0x00, 0x5c };
+static const unsigned short __maybe_unused ModeIndex_640x400[] = { 0x2f, 0x5d, 0x00, 0x5e };
+static const unsigned short __maybe_unused ModeIndex_640x480[] = { 0x2e, 0x44, 0x00, 0x62 };
+static const unsigned short __maybe_unused ModeIndex_720x480[] = { 0x31, 0x33, 0x00, 0x35 };
+static const unsigned short __maybe_unused ModeIndex_720x576[] = { 0x32, 0x34, 0x00, 0x36 };
+static const unsigned short __maybe_unused ModeIndex_768x576[] = { 0x5f, 0x60, 0x00, 0x61 };
+static const unsigned short __maybe_unused ModeIndex_800x480[] = { 0x70, 0x7a, 0x00, 0x76 };
+static const unsigned short __maybe_unused ModeIndex_800x600[] = { 0x30, 0x47, 0x00, 0x63 };
+static const unsigned short __maybe_unused ModeIndex_848x480[] = { 0x39, 0x3b, 0x00, 0x3e };
+static const unsigned short __maybe_unused ModeIndex_856x480[] = { 0x3f, 0x42, 0x00, 0x45 };
+static const unsigned short __maybe_unused ModeIndex_960x540[] = { 0x1d, 0x1e, 0x00, 0x1f };
+static const unsigned short __maybe_unused ModeIndex_960x600[] = { 0x20, 0x21, 0x00, 0x22 };
+static const unsigned short __maybe_unused ModeIndex_1024x768[] = { 0x38, 0x4a, 0x00, 0x64 };
+static const unsigned short __maybe_unused ModeIndex_1024x576[] = { 0x71, 0x74, 0x00, 0x77 };
+static const unsigned short __maybe_unused ModeIndex_1152x864[] = { 0x29, 0x2a, 0x00, 0x2b };
+static const unsigned short __maybe_unused ModeIndex_1280x720[] = { 0x79, 0x75, 0x00, 0x78 };
+static const unsigned short __maybe_unused ModeIndex_1280x768[] = { 0x23, 0x24, 0x00, 0x25 };
+static const unsigned short __maybe_unused ModeIndex_1280x1024[] = { 0x3a, 0x4d, 0x00, 0x65 };
 
-static const unsigned char SiS_MDA_DAC[] = {
+static const unsigned char __maybe_unused SiS_MDA_DAC[] = {
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 	0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15,
 	0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15,
@@ -181,7 +181,7 @@  static const unsigned char SiS_MDA_DAC[] = {
 	0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F
 };
 
-static const unsigned char SiS_CGA_DAC[] = {
+static const unsigned char __maybe_unused SiS_CGA_DAC[] = {
 	0x00, 0x10, 0x04, 0x14, 0x01, 0x11, 0x09, 0x15,
 	0x00, 0x10, 0x04, 0x14, 0x01, 0x11, 0x09, 0x15,
 	0x2A, 0x3A, 0x2E, 0x3E, 0x2B, 0x3B, 0x2F, 0x3F,
@@ -192,7 +192,7 @@  static const unsigned char SiS_CGA_DAC[] = {
 	0x2A, 0x3A, 0x2E, 0x3E, 0x2B, 0x3B, 0x2F, 0x3F
 };
 
-static const unsigned char SiS_EGA_DAC[] = {
+static const unsigned char __maybe_unused SiS_EGA_DAC[] = {
 	0x00, 0x10, 0x04, 0x14, 0x01, 0x11, 0x05, 0x15,
 	0x20, 0x30, 0x24, 0x34, 0x21, 0x31, 0x25, 0x35,
 	0x08, 0x18, 0x0C, 0x1C, 0x09, 0x19, 0x0D, 0x1D,
@@ -203,7 +203,7 @@  static const unsigned char SiS_EGA_DAC[] = {
 	0x2A, 0x3A, 0x2E, 0x3E, 0x2B, 0x3B, 0x2F, 0x3F
 };
 
-static const unsigned char SiS_VGA_DAC[] = {
+static const unsigned char __maybe_unused SiS_VGA_DAC[] = {
 	0x00, 0x10, 0x04, 0x14, 0x01, 0x11, 0x09, 0x15,
 	0x2A, 0x3A, 0x2E, 0x3E, 0x2B, 0x3B, 0x2F, 0x3F,
 	0x00, 0x05, 0x08, 0x0B, 0x0E, 0x11, 0x14, 0x18,
@@ -216,12 +216,12 @@  static const unsigned char SiS_VGA_DAC[] = {
 	0x0B, 0x0C, 0x0D, 0x0F, 0x10
 };
 
-static const struct SiS_St SiSUSB_SModeIDTable[] = {
+static const struct SiS_St __maybe_unused SiSUSB_SModeIDTable[] = {
 	{0x03, 0x0010, 0x18, 0x02, 0x02, 0x00, 0x01, 0x03, 0x40},
 	{0xff, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
 };
 
-static const struct SiS_StResInfo_S SiSUSB_StResInfo[] = {
+static const struct SiS_StResInfo_S __maybe_unused SiSUSB_StResInfo[] = {
 	{640, 400},
 	{640, 350},
 	{720, 400},
@@ -229,7 +229,7 @@  static const struct SiS_StResInfo_S SiSUSB_StResInfo[] = {
 	{640, 480}
 };
 
-static const struct SiS_ModeResInfo SiSUSB_ModeResInfo[] = {
+static const struct SiS_ModeResInfo __maybe_unused SiSUSB_ModeResInfo[] = {
 	{320, 200, 8, 8},	/* 0x00 */
 	{320, 240, 8, 8},	/* 0x01 */
 	{320, 400, 8, 8},	/* 0x02 */
@@ -266,7 +266,7 @@  static const struct SiS_ModeResInfo SiSUSB_ModeResInfo[] = {
 	{960, 600, 8, 16}	/* 0x21 */
 };
 
-static const struct SiS_StandTable SiSUSB_StandTable[] = {
+static const struct SiS_StandTable __maybe_unused SiSUSB_StandTable[] = {
 	/* MD_3_400 - mode 0x03 - 400 */
 	{
 	 0x50, 0x18, 0x10, 0x1000,
@@ -297,7 +297,7 @@  static const struct SiS_StandTable SiSUSB_StandTable[] = {
 	 }
 };
 
-static const struct SiS_Ext SiSUSB_EModeIDTable[] = {
+static const struct SiS_Ext __maybe_unused SiSUSB_EModeIDTable[] = {
 	{0x2e, 0x0a1b, 0x0101, SIS_RI_640x480, 0x00, 0x00, 0x05, 0x05, 0x08, 2},	/* 640x480x8 */
 	{0x2f, 0x0a1b, 0x0100, SIS_RI_640x400, 0x00, 0x00, 0x05, 0x05, 0x10, 0},	/* 640x400x8 */
 	{0x30, 0x2a1b, 0x0103, SIS_RI_800x600, 0x00, 0x00, 0x07, 0x06, 0x00, 3},	/* 800x600x8 */
@@ -376,7 +376,7 @@  static const struct SiS_Ext SiSUSB_EModeIDTable[] = {
 	{0xff, 0x0000, 0x0000, 0, 0x00, 0x00, 0x00, 0x00, 0x00, -1}
 };
 
-static const struct SiS_Ext2 SiSUSB_RefIndex[] = {
+static const struct SiS_Ext2 __maybe_unused SiSUSB_RefIndex[] = {
 	{0x085f, 0x0d, 0x03, 0x05, 0x05, 0x30, 800, 600, 0x40, 0x00, 0x00},	/* 0x0 */
 	{0x0067, 0x0e, 0x04, 0x05, 0x05, 0x30, 800, 600, 0x40, 0x00, 0x00},	/* 0x1 */
 	{0x0067, 0x0f, 0x08, 0x48, 0x05, 0x30, 800, 600, 0x40, 0x00, 0x00},	/* 0x2 */
@@ -434,7 +434,7 @@  static const struct SiS_Ext2 SiSUSB_RefIndex[] = {
 	{0xffff, 0x00, 0x00, 0x00, 0x00, 0x00, 0, 0, 0, 0x00, 0x00}
 };
 
-static const struct SiS_CRT1Table SiSUSB_CRT1Table[] = {
+static const struct SiS_CRT1Table __maybe_unused SiSUSB_CRT1Table[] = {
 	{{0x2d, 0x27, 0x28, 0x90, 0x2c, 0x80, 0xbf, 0x1f,
 	  0x9c, 0x8e, 0x8f, 0x96, 0xb9, 0x30, 0x00, 0x00,
 	  0x00}},		/* 0x0 */
@@ -692,7 +692,7 @@  static const struct SiS_CRT1Table SiSUSB_CRT1Table[] = {
 	  0x41}}		/* 0x54 */
 };
 
-static const struct SiS_VCLKData SiSUSB_VCLKData[] = {
+static const struct SiS_VCLKData __maybe_unused SiSUSB_VCLKData[] = {
 	{0x1b, 0xe1, 25},	/* 0x00 */
 	{0x4e, 0xe4, 28},	/* 0x01 */
 	{0x57, 0xe4, 31},	/* 0x02 */