Thread (23 messages) 23 messages, 3 authors, 2023-04-06
STALE1177d
Revisions (3)
  1. v1 current
  2. v2 [diff vs current]
  3. v3 [diff vs current]

[PATCH 01/18] fbdev: Prepare generic architecture helpers

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2023-04-05 15:06:16
Also in: dri-devel, linux-arch, linux-arm-kernel, linux-fbdev, linux-m68k, linux-mips, linux-sh, lkml, loongarch, sparclinux
Subsystem: generic include/asm header files, the rest · Maintainers: Arnd Bergmann, Linus Torvalds

Generic implementations of fb_pgprotect() and fb_is_primary_device()
have been in the source code for a long time. Prepare the header file
to make use of them.

Improve the code by using an inline function for fb_pgprotect() and
by removing include statements.

Symbols are protected by preprocessor guards. Architectures that
provide a symbol need to define a preprocessor token of the same
name and value. Otherwise the header file will provide a generic
implementation. This pattern has been taken from <asm/io.h>.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 include/asm-generic/fb.h | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/include/asm-generic/fb.h b/include/asm-generic/fb.h
index f9f18101ed36..cb42166e7e11 100644
--- a/include/asm-generic/fb.h
+++ b/include/asm-generic/fb.h
@@ -1,13 +1,29 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+
 #ifndef __ASM_GENERIC_FB_H_
 #define __ASM_GENERIC_FB_H_
-#include <linux/fb.h>
 
-#define fb_pgprotect(...) do {} while (0)
+/*
+ * Only include this header file from your architecture's <asm/fb.h>.
+ */
+
+struct fb_info;
+struct file;
+struct vm_area_struct;
+
+#ifndef fb_pgprotect
+#define fb_pgprotect fb_pgprotect
+static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
+				unsigned long off)
+{ }
+#endif
 
+#ifndef fb_is_primary_device
+#define fb_is_primary_device fb_is_primary_device
 static inline int fb_is_primary_device(struct fb_info *info)
 {
 	return 0;
 }
+#endif
 
 #endif /* __ASM_GENERIC_FB_H_ */
-- 
2.40.0
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help