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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: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Helge Deller <deller@gmx.de> Link: https://patchwork.freedesktop.org/patch/msgid/20230417125651.25126-2-tzimmermann@suse.de
34 lines
687 B
C
34 lines
687 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_FB_H_
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#define __ASM_GENERIC_FB_H_
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/*
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* Only include this header file from your architecture's <asm/fb.h>.
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*/
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#include <linux/mm_types.h>
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#include <linux/pgtable.h>
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struct fb_info;
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struct file;
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#ifndef fb_pgprotect
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#define fb_pgprotect fb_pgprotect
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static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
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unsigned long off)
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{
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vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
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}
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#endif
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#ifndef fb_is_primary_device
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#define fb_is_primary_device fb_is_primary_device
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static inline int fb_is_primary_device(struct fb_info *info)
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{
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return 0;
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}
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#endif
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#endif /* __ASM_GENERIC_FB_H_ */
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