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| author | Cheng Li <lic121@chinatelecom.cn> | 2022-09-09 09:31:09 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 23:03:08 +0200 |
| commit | 14455eabd8404a503dc8e80cd8ce185e96a94b22 (patch) | |
| tree | ebe035ca739c4efeecb5c1679aeb839db43ab101 /mm/internal.h | |
| parent | mm/damon: remove duplicate get_monitoring_region() definitions (diff) | |
| download | linux-14455eabd8404a503dc8e80cd8ce185e96a94b22.tar.xz linux-14455eabd8404a503dc8e80cd8ce185e96a94b22.zip | |
mm: use nth_page instead of mem_map_offset mem_map_next
To handle the discontiguous case, mem_map_next() has a parameter named
`offset`. As a function caller, one would be confused why "get next
entry" needs a parameter named "offset". The other drawback of
mem_map_next() is that the callers must take care of the map between
parameter "iter" and "offset", otherwise we may get an hole or duplication
during iteration. So we use nth_page instead of mem_map_next.
And replace mem_map_offset with nth_page() per Matthew's comments.
Link: https://lkml.kernel.org/r/1662708669-9395-1-git-send-email-lic121@chinatelecom.cn
Signed-off-by: Cheng Li <lic121@chinatelecom.cn>
Fixes: 69d177c2fc70 ("hugetlbfs: handle pages higher order than MAX_ORDER")
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/mm/internal.h b/mm/internal.h index 0f106a3982e7..e497ab14c984 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -638,34 +638,6 @@ static inline void vunmap_range_noflush(unsigned long start, unsigned long end) } #endif /* !CONFIG_MMU */ -/* - * Return the mem_map entry representing the 'offset' subpage within - * the maximally aligned gigantic page 'base'. Handle any discontiguity - * in the mem_map at MAX_ORDER_NR_PAGES boundaries. - */ -static inline struct page *mem_map_offset(struct page *base, int offset) -{ - if (unlikely(offset >= MAX_ORDER_NR_PAGES)) - return nth_page(base, offset); - return base + offset; -} - -/* - * Iterator over all subpages within the maximally aligned gigantic - * page 'base'. Handle any discontiguity in the mem_map. - */ -static inline struct page *mem_map_next(struct page *iter, - struct page *base, int offset) -{ - if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { - unsigned long pfn = page_to_pfn(base) + offset; - if (!pfn_valid(pfn)) - return NULL; - return pfn_to_page(pfn); - } - return iter + 1; -} - /* Memory initialisation debug and verification */ enum mminit_level { MMINIT_WARNING, |