Commit 8cfd014e authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

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: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 61ff748b

mm/hugetlb.c

+8 −3
Original line number Diff line number Diff line
@@ -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)

{