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* [PATCH] staging: fbtft: change 'gamma' array to u32
@ 2017-02-02 14:43 Arnd Bergmann
  2017-02-03  0:11 ` Joe Perches
  0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2017-02-02 14:43 UTC (permalink / raw)
  To: Greg Kroah-Hartman
  Cc: Arnd Bergmann, Thomas Petazzoni, Noralf Trønnes,
	Anson Jacob, devel, linux-kernel

Having a local variable of 1024 bytes on 64-bit architectures is a bit
too much, and I ran into this warning while trying to see what functions
use the largest stack:

drivers/staging/fbtft/fbtft-sysfs.c: In function 'store_gamma_curve':
drivers/staging/fbtft/fbtft-sysfs.c:132:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]

As there is no need for 64-bit gamma values (on 32-bit architectures,
we don't use those either), I'm changing the type from 'unsigned long'
to 'u32' here, which cuts the required space in half everywhere.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/staging/fbtft/fb_hx8340bn.c | 2 +-
 drivers/staging/fbtft/fb_hx8347d.c  | 2 +-
 drivers/staging/fbtft/fb_hx8353d.c  | 2 +-
 drivers/staging/fbtft/fb_ili9163.c  | 2 +-
 drivers/staging/fbtft/fb_ili9320.c  | 2 +-
 drivers/staging/fbtft/fb_ili9325.c  | 2 +-
 drivers/staging/fbtft/fb_ili9341.c  | 2 +-
 drivers/staging/fbtft/fb_pcd8544.c  | 2 +-
 drivers/staging/fbtft/fb_s6d1121.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1289.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1305.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1306.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1325.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1331.c  | 2 +-
 drivers/staging/fbtft/fb_ssd1351.c  | 2 +-
 drivers/staging/fbtft/fb_st7735r.c  | 2 +-
 drivers/staging/fbtft/fb_st7789v.c  | 2 +-
 drivers/staging/fbtft/fb_tls8204.c  | 2 +-
 drivers/staging/fbtft/fbtft-core.c  | 2 +-
 drivers/staging/fbtft/fbtft-sysfs.c | 8 ++++----
 drivers/staging/fbtft/fbtft.h       | 4 ++--
 drivers/staging/fbtft/internal.h    | 2 +-
 22 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/fbtft/fb_hx8340bn.c b/drivers/staging/fbtft/fb_hx8340bn.c
index c24331cc179c..1ca1fcd353d6 100644
--- a/drivers/staging/fbtft/fb_hx8340bn.c
+++ b/drivers/staging/fbtft/fb_hx8340bn.c
@@ -158,7 +158,7 @@ static int set_var(struct fbtft_par *par)
  *   ON0 ON1 CN0 CN1 CN2 CN3 CN4 MN0 MN1 MN2 MN3 MN4 MN5 XXXX  GC
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x0f, 0x0f, 0x1f, 0x0f, 0x0f, 0x0f, 0x1f, 0x07, 0x07, 0x07,
diff --git a/drivers/staging/fbtft/fb_hx8347d.c b/drivers/staging/fbtft/fb_hx8347d.c
index 450a61e3f99c..bbf78f8644a8 100644
--- a/drivers/staging/fbtft/fb_hx8347d.c
+++ b/drivers/staging/fbtft/fb_hx8347d.c
@@ -102,7 +102,7 @@ static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  *   VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,
diff --git a/drivers/staging/fbtft/fb_hx8353d.c b/drivers/staging/fbtft/fb_hx8353d.c
index 72e4ff8c5553..2c18051a44b3 100644
--- a/drivers/staging/fbtft/fb_hx8353d.c
+++ b/drivers/staging/fbtft/fb_hx8353d.c
@@ -118,7 +118,7 @@ static int set_var(struct fbtft_par *par)
 }
 
 /* gamma string format: */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	write_reg(par, 0xE0,
 		  curves[0], curves[1], curves[2], curves[3],
diff --git a/drivers/staging/fbtft/fb_ili9163.c b/drivers/staging/fbtft/fb_ili9163.c
index 6b8f8b17e9a3..579e17734612 100644
--- a/drivers/staging/fbtft/fb_ili9163.c
+++ b/drivers/staging/fbtft/fb_ili9163.c
@@ -202,7 +202,7 @@ static int set_var(struct fbtft_par *par)
 
 #ifdef GAMMA_ADJ
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int gamma_adj(struct fbtft_par *par, unsigned long *curves)
+static int gamma_adj(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
diff --git a/drivers/staging/fbtft/fb_ili9320.c b/drivers/staging/fbtft/fb_ili9320.c
index 278e4c7e95e5..20ba86da028b 100644
--- a/drivers/staging/fbtft/fb_ili9320.c
+++ b/drivers/staging/fbtft/fb_ili9320.c
@@ -221,7 +221,7 @@ static int set_var(struct fbtft_par *par)
  *  VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
diff --git a/drivers/staging/fbtft/fb_ili9325.c b/drivers/staging/fbtft/fb_ili9325.c
index 19e33bab9cac..7189de5ae4b3 100644
--- a/drivers/staging/fbtft/fb_ili9325.c
+++ b/drivers/staging/fbtft/fb_ili9325.c
@@ -215,7 +215,7 @@ static int set_var(struct fbtft_par *par)
  *  VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
diff --git a/drivers/staging/fbtft/fb_ili9341.c b/drivers/staging/fbtft/fb_ili9341.c
index ff35c8624ca3..21a98e9e1a14 100644
--- a/drivers/staging/fbtft/fb_ili9341.c
+++ b/drivers/staging/fbtft/fb_ili9341.c
@@ -121,7 +121,7 @@ static int set_var(struct fbtft_par *par)
  *  Negative: Par1 Par2 [...] Par15
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	int i;
 
diff --git a/drivers/staging/fbtft/fb_pcd8544.c b/drivers/staging/fbtft/fb_pcd8544.c
index 636cc83594bc..87f678a314cc 100644
--- a/drivers/staging/fbtft/fb_pcd8544.c
+++ b/drivers/staging/fbtft/fb_pcd8544.c
@@ -137,7 +137,7 @@ static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
 	return ret;
 }
 
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	/* apply mask */
 	curves[0] &= 0x7F;
diff --git a/drivers/staging/fbtft/fb_s6d1121.c b/drivers/staging/fbtft/fb_s6d1121.c
index 9b1d70b218df..3b36ed50d491 100644
--- a/drivers/staging/fbtft/fb_s6d1121.c
+++ b/drivers/staging/fbtft/fb_s6d1121.c
@@ -130,7 +130,7 @@ static int set_var(struct fbtft_par *par)
  * PKN0 PKN1 PKN2 PKN3 PKN4 PKN5 PKN6 PKN7 PRN8 PRN9 PRN10 PRN11 VRN0 VRN1
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
diff --git a/drivers/staging/fbtft/fb_ssd1289.c b/drivers/staging/fbtft/fb_ssd1289.c
index 6dc085846948..c603e1516e64 100644
--- a/drivers/staging/fbtft/fb_ssd1289.c
+++ b/drivers/staging/fbtft/fb_ssd1289.c
@@ -136,7 +136,7 @@ static int set_var(struct fbtft_par *par)
  * VRN0 VRN1 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 PKN5
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long mask[] = {
 		0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
diff --git a/drivers/staging/fbtft/fb_ssd1305.c b/drivers/staging/fbtft/fb_ssd1305.c
index 4b38c3fadd60..33c03872ca84 100644
--- a/drivers/staging/fbtft/fb_ssd1305.c
+++ b/drivers/staging/fbtft/fb_ssd1305.c
@@ -148,7 +148,7 @@ static int blank(struct fbtft_par *par, bool on)
 }
 
 /* Gamma is used to control Contrast */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	curves[0] &= 0xFF;
 	/* Set Contrast Control for BANK0 */
diff --git a/drivers/staging/fbtft/fb_ssd1306.c b/drivers/staging/fbtft/fb_ssd1306.c
index 76f7da3c7703..722baca03d3a 100644
--- a/drivers/staging/fbtft/fb_ssd1306.c
+++ b/drivers/staging/fbtft/fb_ssd1306.c
@@ -168,7 +168,7 @@ static int blank(struct fbtft_par *par, bool on)
 }
 
 /* Gamma is used to control Contrast */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	/* apply mask */
 	curves[0] &= 0xFF;
diff --git a/drivers/staging/fbtft/fb_ssd1325.c b/drivers/staging/fbtft/fb_ssd1325.c
index 15078bf2aa4b..b7e40c24f58e 100644
--- a/drivers/staging/fbtft/fb_ssd1325.c
+++ b/drivers/staging/fbtft/fb_ssd1325.c
@@ -116,7 +116,7 @@ static int blank(struct fbtft_par *par, bool on)
  * 0 = Setting of GS1 < Setting of GS2 < Setting of GS3.....<
  * Setting of GS14 < Setting of GS15
  */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	int i;
 
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c
index 1d74ac1343a8..3de21897aeaf 100644
--- a/drivers/staging/fbtft/fb_ssd1331.c
+++ b/drivers/staging/fbtft/fb_ssd1331.c
@@ -122,7 +122,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
  * Setting of GS63 has to be > Setting of GS62 +1
  *
  */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
 	int i, acc = 0;
diff --git a/drivers/staging/fbtft/fb_ssd1351.c b/drivers/staging/fbtft/fb_ssd1351.c
index 200aa9ba98f9..d006ba20ef44 100644
--- a/drivers/staging/fbtft/fb_ssd1351.c
+++ b/drivers/staging/fbtft/fb_ssd1351.c
@@ -117,7 +117,7 @@ static int set_var(struct fbtft_par *par)
  *		Setting of GS63 has to be > Setting of GS62 +1
  *
  */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
 	int i, acc = 0;
diff --git a/drivers/staging/fbtft/fb_st7735r.c b/drivers/staging/fbtft/fb_st7735r.c
index 710b74bbba97..24d17cdc71ab 100644
--- a/drivers/staging/fbtft/fb_st7735r.c
+++ b/drivers/staging/fbtft/fb_st7735r.c
@@ -143,7 +143,7 @@ static int set_var(struct fbtft_par *par)
  * VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N
  */
 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	int i, j;
 
diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 085e9872c46d..8935a97ec048 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -178,7 +178,7 @@ static int set_var(struct fbtft_par *par)
  *
  * Return: 0 on success, < 0 if error occurred.
  */
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	int i;
 	int j;
diff --git a/drivers/staging/fbtft/fb_tls8204.c b/drivers/staging/fbtft/fb_tls8204.c
index ae8393b023e4..4302e822de3b 100644
--- a/drivers/staging/fbtft/fb_tls8204.c
+++ b/drivers/staging/fbtft/fb_tls8204.c
@@ -130,7 +130,7 @@ static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
 	return ret;
 }
 
-static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+static int set_gamma(struct fbtft_par *par, u32 *curves)
 {
 	/* apply mask */
 	curves[0] &= 0x7F;
diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index 51c4481db451..7c8af29cdb75 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -661,7 +661,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 	int vmem_size, i;
 	s16 *init_sequence = display->init_sequence;
 	char *gamma = display->gamma;
-	unsigned long *gamma_curves = NULL;
+	u32 *gamma_curves = NULL;
 
 	/* sanity check */
 	if (display->gamma_num * display->gamma_len >
diff --git a/drivers/staging/fbtft/fbtft-sysfs.c b/drivers/staging/fbtft/fbtft-sysfs.c
index 5922f1b6d8d6..6b6fbaa794f4 100644
--- a/drivers/staging/fbtft/fbtft-sysfs.c
+++ b/drivers/staging/fbtft/fbtft-sysfs.c
@@ -16,7 +16,7 @@ static int get_next_ulong(char **str_p, unsigned long *val, char *sep, int base)
 	return kstrtoul(p_val, base, val);
 }
 
-int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves,
+int fbtft_gamma_parse_str(struct fbtft_par *par, u32 *curves,
 						const char *str, int size)
 {
 	char *str_p, *curve_p = NULL;
@@ -89,7 +89,7 @@ int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves,
 }
 
 static ssize_t
-sprintf_gamma(struct fbtft_par *par, unsigned long *curves, char *buf)
+sprintf_gamma(struct fbtft_par *par, u32 *curves, char *buf)
 {
 	ssize_t len = 0;
 	unsigned int i, j;
@@ -98,7 +98,7 @@ sprintf_gamma(struct fbtft_par *par, unsigned long *curves, char *buf)
 	for (i = 0; i < par->gamma.num_curves; i++) {
 		for (j = 0; j < par->gamma.num_values; j++)
 			len += scnprintf(&buf[len], PAGE_SIZE,
-			     "%04lx ", curves[i * par->gamma.num_values + j]);
+			     "%04x ", curves[i * par->gamma.num_values + j]);
 		buf[len - 1] = '\n';
 	}
 	mutex_unlock(&par->gamma.lock);
@@ -112,7 +112,7 @@ static ssize_t store_gamma_curve(struct device *device,
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
 	struct fbtft_par *par = fb_info->par;
-	unsigned long tmp_curves[FBTFT_GAMMA_MAX_VALUES_TOTAL];
+	u32 tmp_curves[FBTFT_GAMMA_MAX_VALUES_TOTAL];
 	int ret;
 
 	ret = fbtft_gamma_parse_str(par, tmp_curves, buf, count);
diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
index b09804773ff2..44cf94d160d4 100644
--- a/drivers/staging/fbtft/fbtft.h
+++ b/drivers/staging/fbtft/fbtft.h
@@ -92,7 +92,7 @@ struct fbtft_ops {
 	void (*unregister_backlight)(struct fbtft_par *par);
 
 	int (*set_var)(struct fbtft_par *par);
-	int (*set_gamma)(struct fbtft_par *par, unsigned long *curves);
+	int (*set_gamma)(struct fbtft_par *par, u32 *curves);
 };
 
 /**
@@ -231,7 +231,7 @@ struct fbtft_par {
 	s16 *init_sequence;
 	struct {
 		struct mutex lock;
-		unsigned long *curves;
+		u32 *curves;
 		int num_values;
 		int num_curves;
 	} gamma;
diff --git a/drivers/staging/fbtft/internal.h b/drivers/staging/fbtft/internal.h
index eea0ec5ff4d3..25b9bf6f54bb 100644
--- a/drivers/staging/fbtft/internal.h
+++ b/drivers/staging/fbtft/internal.h
@@ -19,7 +19,7 @@
 void fbtft_sysfs_init(struct fbtft_par *par);
 void fbtft_sysfs_exit(struct fbtft_par *par);
 void fbtft_expand_debug_value(unsigned long *debug);
-int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves,
+int fbtft_gamma_parse_str(struct fbtft_par *par, u32 *curves,
 			  const char *str, int size);
 
 #endif /* __LINUX_FBTFT_INTERNAL_H */
-- 
2.9.0

^ permalink raw reply related	[flat|nested] 2+ messages in thread
* Re: [PATCH] staging: fbtft: change 'gamma' array to u32
  2017-02-02 14:43 [PATCH] staging: fbtft: change 'gamma' array to u32 Arnd Bergmann
@ 2017-02-03  0:11 ` Joe Perches
  0 siblings, 0 replies; 2+ messages in thread
From: Joe Perches @ 2017-02-03  0:11 UTC (permalink / raw)
  To: Arnd Bergmann, Greg Kroah-Hartman
  Cc: Thomas Petazzoni, Noralf Trønnes, Anson Jacob, devel, linux-kernel

On Thu, 2017-02-02 at 15:43 +0100, Arnd Bergmann wrote:
> Having a local variable of 1024 bytes on 64-bit architectures is a bit
> too much, and I ran into this warning while trying to see what functions
> use the largest stack:
> 
> drivers/staging/fbtft/fbtft-sysfs.c: In function 'store_gamma_curve':
> drivers/staging/fbtft/fbtft-sysfs.c:132:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> As there is no need for 64-bit gamma values (on 32-bit architectures,
> we don't use those either), I'm changing the type from 'unsigned long'
> to 'u32' here, which cuts the required space in half everywhere.
[]
> diff --git a/drivers/staging/fbtft/fb_hx8347d.c b/drivers/staging/fbtft/fb_hx8347d.c
[]
> @@ -102,7 +102,7 @@ static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
>   *   VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
>   */
>  #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
> -static int set_gamma(struct fbtft_par *par, unsigned long *curves)
> +static int set_gamma(struct fbtft_par *par, u32 *curves)
>  {
>  	unsigned long mask[] = {
>  		0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,

presumably these should be static const and maybe u8 or u32 too

> diff --git a/drivers/staging/fbtft/fb_ili9163.c b/drivers/staging/fbtft/fb_ili9163.c
[]
> @@ -202,7 +202,7 @@ static int set_var(struct fbtft_par *par)
>  
>  #ifdef GAMMA_ADJ
>  #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
> -static int gamma_adj(struct fbtft_par *par, unsigned long *curves)
> +static int gamma_adj(struct fbtft_par *par, u32 *curves)
>  {
>  	unsigned long mask[] = {
>  		0x3F, 0x3F, 0x3F, 0x3F, 0x3F,

etc...

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2017-02-02 14:43 [PATCH] staging: fbtft: change 'gamma' array to u32 Arnd Bergmann
2017-02-03  0:11 ` Joe Perches

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