From 78179556e7605ba07fd3ddba6ab8891fa457b93e Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Fri, 16 Nov 2018 15:08:29 -0800 Subject: [PATCH] mm/gup.c: fix follow_page_mask() kerneldoc comment Commit df06b37ffe5a ("mm/gup: cache dev_pagemap while pinning pages") modified the signature of follow_page_mask() but left the parameter description behind. Update the description to make the code and comments agree again. While at it, update formatting of the return value description to match Documentation/doc-guide/kernel-doc.rst guidelines. Link: http://lkml.kernel.org/r/1541603316-27832-1-git-send-email-rppt@linux.ibm.com Signed-off-by: Mike Rapoport Reviewed-by: Andrew Morton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/gup.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index f76e77a2d34b..aa43620a3270 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -385,11 +385,17 @@ static struct page *follow_p4d_mask(struct vm_area_struct *vma, * @vma: vm_area_struct mapping @address * @address: virtual address to look up * @flags: flags modifying lookup behaviour - * @page_mask: on output, *page_mask is set according to the size of the page + * @ctx: contains dev_pagemap for %ZONE_DEVICE memory pinning and a + * pointer to output page_mask * * @flags can have FOLL_ flags set, defined in * - * Returns the mapped (struct page *), %NULL if no mapping exists, or + * When getting pages from ZONE_DEVICE memory, the @ctx->pgmap caches + * the device's dev_pagemap metadata to avoid repeating expensive lookups. + * + * On output, the @ctx->page_mask is set according to the size of the page. + * + * Return: the mapped (struct page *), %NULL if no mapping exists, or * an error pointer if there is a mapping to something not represented * by a page descriptor (see also vm_normal_page()). */