From 8cfd014efd93e9450fcd4892bbfe8b10f41e53c3 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Tue, 22 Aug 2023 18:24:59 +0100 Subject: hugetlb: add documentation for vma_kernel_pagesize() This is an exported symbol, so it should have kernel-doc. Update it to mention folios, and point out that they might be larger than the supported page size for this VMA. Link: https://lkml.kernel.org/r/20230822172459.4190699-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: Mike Kravetz Signed-off-by: Andrew Morton --- mm/hugetlb.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'mm') diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cbc25826c9b0..ba6d39b71cb1 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -968,9 +968,14 @@ pgoff_t linear_hugepage_index(struct vm_area_struct *vma, } EXPORT_SYMBOL_GPL(linear_hugepage_index); -/* - * Return the size of the pages allocated when backing a VMA. In the majority - * cases this will be same size as used by the page table entries. +/** + * vma_kernel_pagesize - Page size granularity for this VMA. + * @vma: The user mapping. + * + * Folios in this VMA will be aligned to, and at least the size of the + * number of bytes returned by this function. + * + * Return: The default size of the folios allocated when backing a VMA. */ unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) { -- cgit v1.2.3