From 7dac0ec8fa3f4977d04974e94806dfa8bdac7ed2 Mon Sep 17 00:00:00 2001 From: "Vishal Moola (Oracle)" Date: Wed, 21 Feb 2024 15:47:30 -0800 Subject: hugetlb: pass struct vm_fault through to hugetlb_handle_userfault() Now that hugetlb_fault() has a struct vm_fault, have hugetlb_handle_userfault() use it instead of creating one of its own. This lets us reduce the number of arguments passed to hugetlb_handle_userfault() from 7 to 3, cleaning up the code and stack. Link: https://lkml.kernel.org/r/20240221234732.187629-4-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Matthew Wilcox (Oracle) Cc: Muchun Song Signed-off-by: Andrew Morton --- mm/hugetlb.c | 38 +++++++++----------------------------- 1 file changed, 9 insertions(+), 29 deletions(-) (limited to 'mm') diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 02673926b3bb0..fa695e71152cd 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6085,39 +6085,21 @@ int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping return 0; } -static inline vm_fault_t hugetlb_handle_userfault(struct vm_area_struct *vma, +static inline vm_fault_t hugetlb_handle_userfault(struct vm_fault *vmf, struct address_space *mapping, - pgoff_t idx, - unsigned int flags, - unsigned long haddr, - unsigned long addr, unsigned long reason) { u32 hash; - struct vm_fault vmf = { - .vma = vma, - .address = haddr, - .real_address = addr, - .flags = flags, - - /* - * Hard to debug if it ends up being - * used by a callee that assumes - * something about the other - * uninitialized fields... same as in - * memory.c - */ - }; /* * vma_lock and hugetlb_fault_mutex must be dropped before handling * userfault. Also mmap_lock could be dropped due to handling * userfault, any vma operation should be careful from here. */ - hugetlb_vma_unlock_read(vma); - hash = hugetlb_fault_mutex_hash(mapping, idx); + hugetlb_vma_unlock_read(vmf->vma); + hash = hugetlb_fault_mutex_hash(mapping, vmf->pgoff); mutex_unlock(&hugetlb_fault_mutex_table[hash]); - return handle_userfault(&vmf, reason); + return handle_userfault(vmf, reason); } /* @@ -6141,7 +6123,8 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, struct address_space *mapping, pgoff_t idx, unsigned long address, pte_t *ptep, - pte_t old_pte, unsigned int flags) + pte_t old_pte, unsigned int flags, + struct vm_fault *vmf) { struct hstate *h = hstate_vma(vma); vm_fault_t ret = VM_FAULT_SIGBUS; @@ -6200,8 +6183,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, goto out; } - return hugetlb_handle_userfault(vma, mapping, idx, flags, - haddr, address, + return hugetlb_handle_userfault(vmf, mapping, VM_UFFD_MISSING); } @@ -6273,8 +6255,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm, ret = 0; goto out; } - return hugetlb_handle_userfault(vma, mapping, idx, flags, - haddr, address, + return hugetlb_handle_userfault(vmf, mapping, VM_UFFD_MINOR); } } @@ -6444,9 +6425,8 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, * hugetlb_no_page will drop vma lock and hugetlb fault * mutex internally, which make us return immediately. */ - return hugetlb_no_page(mm, vma, mapping, vmf.pgoff, address, - ptep, entry, flags); + ptep, entry, flags, &vmf); } ret = 0; -- cgit 1.2.3-korg