Commit 91254a4d authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

fbdev: Prepare generic architecture helpers 



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. The default mode set by
fb_pgprotect() is now writecombine, which is what most platforms
want.

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>.

v3:
	* include the correct header files
v2:
	*  use writecombine mappings by default (Arnd)

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarHelge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230417125651.25126-2-tzimmermann@suse.de
parent c91acda3

include/asm-generic/fb.h

+22 −2
Original line number Diff line number Diff line 
/* 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>.

 */



#include <linux/mm_types.h>

#include <linux/pgtable.h>



struct fb_info;

struct file;



#ifndef fb_pgprotect

#define fb_pgprotect fb_pgprotect

static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,

				unsigned long off)

{

	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

}

#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_ */