From 7b86ac3371b70c3fd8fd95501719beb1faab719f Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 28 Aug 2019 16:19:54 +0200 Subject: pagewalk: separate function pointers from iterator data The mm_walk structure currently mixed data and code. Split out the operations vectors into a new mm_walk_ops structure, and while we are changing the API also declare the mm_walk structure inside the walk_page_range and walk_page_vma functions. Based on patch from Linus Torvalds. Link: https://lore.kernel.org/r/20190828141955.22210-3-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Thomas Hellstrom Reviewed-by: Steven Price Reviewed-by: Jason Gunthorpe Signed-off-by: Jason Gunthorpe --- mm/mprotect.c | 24 +++++++++--------------- 1 file changed, 9 insertions(+), 15 deletions(-) (limited to 'mm/mprotect.c') diff --git a/mm/mprotect.c b/mm/mprotect.c index cc73318dbc25..675e5d34a507 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -329,20 +329,11 @@ static int prot_none_test(unsigned long addr, unsigned long next, return 0; } -static int prot_none_walk(struct vm_area_struct *vma, unsigned long start, - unsigned long end, unsigned long newflags) -{ - pgprot_t new_pgprot = vm_get_page_prot(newflags); - struct mm_walk prot_none_walk = { - .pte_entry = prot_none_pte_entry, - .hugetlb_entry = prot_none_hugetlb_entry, - .test_walk = prot_none_test, - .mm = current->mm, - .private = &new_pgprot, - }; - - return walk_page_range(start, end, &prot_none_walk); -} +static const struct mm_walk_ops prot_none_walk_ops = { + .pte_entry = prot_none_pte_entry, + .hugetlb_entry = prot_none_hugetlb_entry, + .test_walk = prot_none_test, +}; int mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev, @@ -369,7 +360,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev, if (arch_has_pfn_modify_check() && (vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) && (newflags & (VM_READ|VM_WRITE|VM_EXEC)) == 0) { - error = prot_none_walk(vma, start, end, newflags); + pgprot_t new_pgprot = vm_get_page_prot(newflags); + + error = walk_page_range(current->mm, start, end, + &prot_none_walk_ops, &new_pgprot); if (error) return error; } -- cgit