Putting a large drm_connector object on the stack can lead to warnings
in some configuration, such as:
drivers/gpu/drm/selftests/test-drm_cmdline_parser.c:18:12: error: stack frame size of 1040 bytes in function 'drm_cmdline_test_res' [-Werror,-Wframe-larger-than=]
static int drm_cmdline_test_res(void *ignored)
Since the object is never modified, just declare it as 'static const'
and allow this to be passed down.
Fixes: b7ced38916a9 ("drm/selftests: Add command line parser selftests")
Signed-off-by: Arnd Bergmann <[email protected]>
---
drivers/gpu/drm/drm_modes.c | 8 +-
.../drm/selftests/test-drm_cmdline_parser.c | 136 +++++++-----------
include/drm/drm_modes.h | 2 +-
3 files changed, 53 insertions(+), 93 deletions(-)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 57e6408288c8..910561d4f071 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1448,7 +1448,7 @@ static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
}
static int drm_mode_parse_cmdline_extra(const char *str, int length,
- struct drm_connector *connector,
+ const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
int i;
@@ -1493,7 +1493,7 @@ static int drm_mode_parse_cmdline_extra(const char *str, int length,
static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
bool extras,
- struct drm_connector *connector,
+ const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
const char *str_start = str;
@@ -1555,7 +1555,7 @@ static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
}
static int drm_mode_parse_cmdline_options(char *str, size_t len,
- struct drm_connector *connector,
+ const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
unsigned int rotation = 0;
@@ -1689,7 +1689,7 @@ static int drm_mode_parse_cmdline_options(char *str, size_t len,
* True if a valid modeline has been parsed, false otherwise.
*/
bool drm_mode_parse_command_line_for_connector(const char *mode_option,
- struct drm_connector *connector,
+ const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
const char *name;
diff --git a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
index bef4edde6f9f..14c96edb13df 100644
--- a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
+++ b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
@@ -15,13 +15,14 @@
#include "drm_selftest.h"
#include "test-drm_modeset_common.h"
+static const struct drm_connector no_connector = {};
+
static int drm_cmdline_test_res(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -42,11 +43,10 @@ static int drm_cmdline_test_res(void *ignored)
static int drm_cmdline_test_res_missing_x(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("x480",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -54,11 +54,10 @@ static int drm_cmdline_test_res_missing_x(void *ignored)
static int drm_cmdline_test_res_missing_y(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("1024x",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -66,11 +65,10 @@ static int drm_cmdline_test_res_missing_y(void *ignored)
static int drm_cmdline_test_res_bad_y(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("1024xtest",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -78,11 +76,10 @@ static int drm_cmdline_test_res_bad_y(void *ignored)
static int drm_cmdline_test_res_missing_y_bpp(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("1024x-24",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -90,11 +87,10 @@ static int drm_cmdline_test_res_missing_y_bpp(void *ignored)
static int drm_cmdline_test_res_vesa(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480M",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -115,11 +111,10 @@ static int drm_cmdline_test_res_vesa(void *ignored)
static int drm_cmdline_test_res_vesa_rblank(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480MR",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -140,11 +135,10 @@ static int drm_cmdline_test_res_vesa_rblank(void *ignored)
static int drm_cmdline_test_res_rblank(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480R",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -165,11 +159,10 @@ static int drm_cmdline_test_res_rblank(void *ignored)
static int drm_cmdline_test_res_bpp(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -191,11 +184,10 @@ static int drm_cmdline_test_res_bpp(void *ignored)
static int drm_cmdline_test_res_bad_bpp(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480-test",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -203,11 +195,10 @@ static int drm_cmdline_test_res_bad_bpp(void *ignored)
static int drm_cmdline_test_res_refresh(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480@60",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -229,11 +220,10 @@ static int drm_cmdline_test_res_refresh(void *ignored)
static int drm_cmdline_test_res_bad_refresh(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480@refresh",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -241,11 +231,10 @@ static int drm_cmdline_test_res_bad_refresh(void *ignored)
static int drm_cmdline_test_res_bpp_refresh(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -268,11 +257,10 @@ static int drm_cmdline_test_res_bpp_refresh(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_interlaced(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60i",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -295,11 +283,10 @@ static int drm_cmdline_test_res_bpp_refresh_interlaced(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_margins(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60m",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -322,11 +309,10 @@ static int drm_cmdline_test_res_bpp_refresh_margins(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_force_off(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60d",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -349,11 +335,10 @@ static int drm_cmdline_test_res_bpp_refresh_force_off(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_force_on_off(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480-24@60de",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -361,11 +346,10 @@ static int drm_cmdline_test_res_bpp_refresh_force_on_off(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_force_on(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60e",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -388,11 +372,10 @@ static int drm_cmdline_test_res_bpp_refresh_force_on(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_force_on_analog(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60D",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -415,10 +398,11 @@ static int drm_cmdline_test_res_bpp_refresh_force_on_analog(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_force_on_digital(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
+ static const struct drm_connector connector = {
+ .connector_type = DRM_MODE_CONNECTOR_DVII,
+ };
- connector.connector_type = DRM_MODE_CONNECTOR_DVII;
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60D",
&connector,
&mode));
@@ -443,11 +427,10 @@ static int drm_cmdline_test_res_bpp_refresh_force_on_digital(void *ignored)
static int drm_cmdline_test_res_bpp_refresh_interlaced_margins_force_on(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480-24@60ime",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -470,11 +453,10 @@ static int drm_cmdline_test_res_bpp_refresh_interlaced_margins_force_on(void *ig
static int drm_cmdline_test_res_margins_force_on(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480me",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -495,11 +477,10 @@ static int drm_cmdline_test_res_margins_force_on(void *ignored)
static int drm_cmdline_test_res_vesa_margins(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480Mm",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -520,11 +501,10 @@ static int drm_cmdline_test_res_vesa_margins(void *ignored)
static int drm_cmdline_test_res_invalid_mode(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480f",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -532,11 +512,10 @@ static int drm_cmdline_test_res_invalid_mode(void *ignored)
static int drm_cmdline_test_res_bpp_wrong_place_mode(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480e-24",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -544,11 +523,10 @@ static int drm_cmdline_test_res_bpp_wrong_place_mode(void *ignored)
static int drm_cmdline_test_name(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("NTSC",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(strcmp(mode.name, "NTSC"));
FAIL_ON(mode.refresh_specified);
@@ -559,11 +537,10 @@ static int drm_cmdline_test_name(void *ignored)
static int drm_cmdline_test_name_bpp(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("NTSC-24",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(strcmp(mode.name, "NTSC"));
@@ -577,11 +554,10 @@ static int drm_cmdline_test_name_bpp(void *ignored)
static int drm_cmdline_test_name_bpp_refresh(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("NTSC-24@60",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -589,11 +565,10 @@ static int drm_cmdline_test_name_bpp_refresh(void *ignored)
static int drm_cmdline_test_name_refresh(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("NTSC@60",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -601,11 +576,10 @@ static int drm_cmdline_test_name_refresh(void *ignored)
static int drm_cmdline_test_name_refresh_wrong_mode(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("NTSC@60m",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -613,11 +587,10 @@ static int drm_cmdline_test_name_refresh_wrong_mode(void *ignored)
static int drm_cmdline_test_name_refresh_invalid_mode(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("NTSC@60f",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -625,11 +598,10 @@ static int drm_cmdline_test_name_refresh_invalid_mode(void *ignored)
static int drm_cmdline_test_name_option(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("NTSC,rotate=180",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(strcmp(mode.name, "NTSC"));
@@ -640,11 +612,10 @@ static int drm_cmdline_test_name_option(void *ignored)
static int drm_cmdline_test_name_bpp_option(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("NTSC-24,rotate=180",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(strcmp(mode.name, "NTSC"));
@@ -657,11 +628,10 @@ static int drm_cmdline_test_name_bpp_option(void *ignored)
static int drm_cmdline_test_rotate_0(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,rotate=0",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -683,11 +653,10 @@ static int drm_cmdline_test_rotate_0(void *ignored)
static int drm_cmdline_test_rotate_90(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,rotate=90",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -709,11 +678,10 @@ static int drm_cmdline_test_rotate_90(void *ignored)
static int drm_cmdline_test_rotate_180(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,rotate=180",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -735,11 +703,10 @@ static int drm_cmdline_test_rotate_180(void *ignored)
static int drm_cmdline_test_rotate_270(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,rotate=270",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -761,11 +728,10 @@ static int drm_cmdline_test_rotate_270(void *ignored)
static int drm_cmdline_test_rotate_invalid_val(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480,rotate=42",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -773,11 +739,10 @@ static int drm_cmdline_test_rotate_invalid_val(void *ignored)
static int drm_cmdline_test_rotate_truncated(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480,rotate=",
- &connector,
+ &no_connector,
&mode));
return 0;
@@ -785,11 +750,10 @@ static int drm_cmdline_test_rotate_truncated(void *ignored)
static int drm_cmdline_test_hmirror(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,reflect_x",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -811,11 +775,10 @@ static int drm_cmdline_test_hmirror(void *ignored)
static int drm_cmdline_test_vmirror(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,reflect_y",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -837,11 +800,10 @@ static int drm_cmdline_test_vmirror(void *ignored)
static int drm_cmdline_test_margin_options(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,margin_right=14,margin_left=24,margin_bottom=36,margin_top=42",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -866,11 +828,10 @@ static int drm_cmdline_test_margin_options(void *ignored)
static int drm_cmdline_test_multiple_options(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480,rotate=270,reflect_x",
- &connector,
+ &no_connector,
&mode));
FAIL_ON(!mode.specified);
FAIL_ON(mode.xres != 720);
@@ -892,11 +853,10 @@ static int drm_cmdline_test_multiple_options(void *ignored)
static int drm_cmdline_test_invalid_option(void *ignored)
{
- struct drm_connector connector = { };
struct drm_cmdline_mode mode = { };
FAIL_ON(drm_mode_parse_command_line_for_connector("720x480,test=42",
- &connector,
+ &no_connector,
&mode));
return 0;
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 083f16747369..e946e20c61d8 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -537,7 +537,7 @@ void drm_connector_list_update(struct drm_connector *connector);
/* parsing cmdline modes */
bool
drm_mode_parse_command_line_for_connector(const char *mode_option,
- struct drm_connector *connector,
+ const struct drm_connector *connector,
struct drm_cmdline_mode *mode);
struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device *dev,
--
2.20.0
On Fri, Jun 28, 2019 at 02:16:45PM +0200, Arnd Bergmann wrote:
> Putting a large drm_connector object on the stack can lead to warnings
> in some configuration, such as:
>
> drivers/gpu/drm/selftests/test-drm_cmdline_parser.c:18:12: error: stack frame size of 1040 bytes in function 'drm_cmdline_test_res' [-Werror,-Wframe-larger-than=]
> static int drm_cmdline_test_res(void *ignored)
>
> Since the object is never modified, just declare it as 'static const'
> and allow this to be passed down.
>
> Fixes: b7ced38916a9 ("drm/selftests: Add command line parser selftests")
> Signed-off-by: Arnd Bergmann <[email protected]>
Applied, thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com