Le 05/03/2024 à 11:04, Thomas Zimmermann a écrit :

Hi

Am 05.03.24 um 10:25 schrieb Christophe Leroy:

quoted

Le 05/03/2024 à 10:01, Thomas Zimmermann a écrit :

quoted

Replace <linux/fb.h> with a forward declaration in <asm/backlight.h> to
resolves an unnecessary dependency. Remove pmac_backlight_curve_lookup()
and struct fb_info from source and header files. The function and the
framebuffer struct is unused. No functional changes.

When you remove pmac_backlight_curve_lookup() prototype you'll then get
a warning/error about missing prototype when building
arch/powerpc/platforms/powermac/backlight.c

The fonction is not used outside of that file so it should be static.
And then it is not used in that file either so it should be removed
completely. Indeed last use of that function was removed by commit
d565dd3b0824 ("[PATCH] powerpc: More via-pmu backlight fixes") so the
function can safely be removed.

Isn't that what my patch is doing? I have no callers of the function in 
my tree (drm-tip), so I removed it entirely. Should I add a Fixes tag 
against commit d565dd3b0824? Best regards Thomas

Sorry I overlooked your patch and focussed on the removal of the 
prototype and missed the removal of the function.

Christophe

quoted

Christophe

quoted

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
   arch/powerpc/include/asm/backlight.h        |  5 ++--
   arch/powerpc/platforms/powermac/backlight.c | 26 
---------------------
   2 files changed, 2 insertions(+), 29 deletions(-)

diff --git a/arch/powerpc/include/asm/backlight.h 

b/arch/powerpc/include/asm/backlight.h
index 1b5eab62ed047..061a910d74929 100644

--- a/arch/powerpc/include/asm/backlight.h
+++ b/arch/powerpc/include/asm/backlight.h

@@ -10,15 +10,14 @@

   #define __ASM_POWERPC_BACKLIGHT_H
   #ifdef __KERNEL__
-#include <linux/fb.h>
   #include <linux/mutex.h>
+struct backlight_device;
+
   /* For locking instructions, see the implementation file */
   extern struct backlight_device *pmac_backlight;
   extern struct mutex pmac_backlight_mutex;
-extern int pmac_backlight_curve_lookup(struct fb_info *info, int 
value);
-
   extern int pmac_has_backlight_type(const char *type);
   extern void pmac_backlight_key(int direction);

diff --git a/arch/powerpc/platforms/powermac/backlight.c 

b/arch/powerpc/platforms/powermac/backlight.c
index aeb79a8b3e109..12bc01353bd3c 100644

--- a/arch/powerpc/platforms/powermac/backlight.c
+++ b/arch/powerpc/platforms/powermac/backlight.c

@@ -9,7 +9,6 @@

    */
   #include <linux/kernel.h>
-#include <linux/fb.h>
   #include <linux/backlight.h>
   #include <linux/adb.h>
   #include <linux/pmu.h>

@@ -72,31 +71,6 @@ int pmac_has_backlight_type(const char *type)

       return 0;
   }
-int pmac_backlight_curve_lookup(struct fb_info *info, int value)
-{
-    int level = (FB_BACKLIGHT_LEVELS - 1);
-
-    if (info && info->bl_dev) {
-        int i, max = 0;
-
-        /* Look for biggest value */
-        for (i = 0; i < FB_BACKLIGHT_LEVELS; i++)
-            max = max((int)info->bl_curve[i], max);
-
-        /* Look for nearest value */
-        for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) {
-            int diff = abs(info->bl_curve[i] - value);
-            if (diff < max) {
-                max = diff;
-                level = i;
-            }
-        }
-
-    }
-
-    return level;
-}
-
   static void pmac_backlight_key_worker(struct work_struct *work)
   {
       if (atomic_read(&kernel_backlight_disabled))