linuxkpi: Add pin_user_pages*()
functions
They were defined in the i915 DRM driver. I move the code in linuxkpi so it can benefit other drivers. Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D38078
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@ -257,25 +257,54 @@ get_page(struct vm_page *page)
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extern long
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get_user_pages(unsigned long start, unsigned long nr_pages,
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int gup_flags, struct page **,
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unsigned int gup_flags, struct page **,
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struct vm_area_struct **);
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static inline long
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pin_user_pages(unsigned long start, unsigned long nr_pages,
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unsigned int gup_flags, struct page **pages,
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struct vm_area_struct **vmas)
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{
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return get_user_pages(start, nr_pages, gup_flags, pages, vmas);
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}
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extern int
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__get_user_pages_fast(unsigned long start, int nr_pages, int write,
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struct page **);
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static inline int
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pin_user_pages_fast(unsigned long start, int nr_pages,
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unsigned int gup_flags, struct page **pages)
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{
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return __get_user_pages_fast(
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start, nr_pages, !!(gup_flags & FOLL_WRITE), pages);
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}
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extern long
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get_user_pages_remote(struct task_struct *, struct mm_struct *,
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unsigned long start, unsigned long nr_pages,
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int gup_flags, struct page **,
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unsigned int gup_flags, struct page **,
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struct vm_area_struct **);
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static inline long
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pin_user_pages_remote(struct task_struct *task, struct mm_struct *mm,
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unsigned long start, unsigned long nr_pages,
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unsigned int gup_flags, struct page **pages,
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struct vm_area_struct **vmas)
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{
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return get_user_pages_remote(
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task, mm, start, nr_pages, gup_flags, pages, vmas);
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}
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static inline void
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put_page(struct vm_page *page)
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{
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vm_page_unwire(page, PQ_ACTIVE);
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}
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#define unpin_user_page(page) put_page(page)
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#define unpin_user_pages(pages, npages) release_pages(pages, npages)
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#define copy_highpage(to, from) pmap_copy_page(from, to)
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static inline pgprot_t
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@ -249,7 +249,7 @@ __get_user_pages_fast(unsigned long start, int nr_pages, int write,
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long
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get_user_pages_remote(struct task_struct *task, struct mm_struct *mm,
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unsigned long start, unsigned long nr_pages, int gup_flags,
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unsigned long start, unsigned long nr_pages, unsigned int gup_flags,
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struct page **pages, struct vm_area_struct **vmas)
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{
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vm_map_t map;
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@ -260,8 +260,8 @@ get_user_pages_remote(struct task_struct *task, struct mm_struct *mm,
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}
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long
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get_user_pages(unsigned long start, unsigned long nr_pages, int gup_flags,
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struct page **pages, struct vm_area_struct **vmas)
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get_user_pages(unsigned long start, unsigned long nr_pages,
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unsigned int gup_flags, struct page **pages, struct vm_area_struct **vmas)
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{
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vm_map_t map;
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