From 2b7403035459c75e193c6b04a293e518a4212de0 Mon Sep 17 00:00:00 2001 From: Souptick Joarder Date: Thu, 23 Aug 2018 17:01:36 -0700 Subject: mm: Change return type int to vm_fault_t for fault handlers Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type. Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t") The aim is to change the return type of finish_fault() and handle_mm_fault() to vm_fault_t type. As part of that clean up return type of all other recursively called functions have been changed to vm_fault_t type. The places from where handle_mm_fault() is getting invoked will be change to vm_fault_t type but in a separate patch. vmf_error() is the newly introduce inline function in 4.17-rc6. [akpm@linux-foundation.org: don't shadow outer local `ret' in __do_huge_pmd_anonymous_page()] Link: http://lkml.kernel.org/r/20180604171727.GA20279@jordon-HP-15-Notebook-PC Signed-off-by: Souptick Joarder Reviewed-by: Matthew Wilcox Reviewed-by: Andrew Morton Cc: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/huge_mm.h | 9 +++++---- include/linux/hugetlb.h | 2 +- include/linux/mm.h | 14 +++++++------- include/linux/oom.h | 2 +- include/linux/swapops.h | 5 +++-- include/linux/userfaultfd_k.h | 5 +++-- 6 files changed, 20 insertions(+), 17 deletions(-) (limited to 'include/linux') diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index a8a126259bc4..27e3e32135a8 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -6,7 +6,7 @@ #include /* only for vma_is_dax() */ -extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf); +extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf); extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, struct vm_area_struct *vma); @@ -23,7 +23,7 @@ static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) } #endif -extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd); +extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd); extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, @@ -216,7 +216,7 @@ struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, pud_t *pud, int flags); -extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd); +extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd); extern struct page *huge_zero_page; @@ -321,7 +321,8 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, return NULL; } -static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd) +static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, + pmd_t orig_pmd) { return 0; } diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index c39d9170a8a0..6b68e345f0ca 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -105,7 +105,7 @@ void hugetlb_report_meminfo(struct seq_file *); int hugetlb_report_node_meminfo(int, char *); void hugetlb_show_meminfo(void); unsigned long hugetlb_total_pages(void); -int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, +vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, unsigned int flags); int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte, struct vm_area_struct *dst_vma, diff --git a/include/linux/mm.h b/include/linux/mm.h index a9e733b5fb76..8fcc36660de6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -728,10 +728,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) return pte; } -int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg, +vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg, struct page *page); -int finish_fault(struct vm_fault *vmf); -int finish_mkwrite_fault(struct vm_fault *vmf); +vm_fault_t finish_fault(struct vm_fault *vmf); +vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf); #endif /* @@ -1403,8 +1403,8 @@ int generic_error_remove_page(struct address_space *mapping, struct page *page); int invalidate_inode_page(struct page *page); #ifdef CONFIG_MMU -extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address, - unsigned int flags); +extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, + unsigned long address, unsigned int flags); extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, unsigned long address, unsigned int fault_flags, bool *unlocked); @@ -1413,7 +1413,7 @@ void unmap_mapping_pages(struct address_space *mapping, void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows); #else -static inline int handle_mm_fault(struct vm_area_struct *vma, +static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, unsigned int flags) { /* should never happen if there's no MMU */ @@ -2563,7 +2563,7 @@ static inline struct page *follow_page(struct vm_area_struct *vma, #define FOLL_COW 0x4000 /* internal GUP flag */ #define FOLL_ANON 0x8000 /* don't do file mappings */ -static inline int vm_fault_to_errno(int vm_fault, int foll_flags) +static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) { if (vm_fault & VM_FAULT_OOM) return -ENOMEM; diff --git a/include/linux/oom.h b/include/linux/oom.h index 92f70e4c6252..69864a547663 100644 --- a/include/linux/oom.h +++ b/include/linux/oom.h @@ -88,7 +88,7 @@ static inline bool mm_is_oom_victim(struct mm_struct *mm) * * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise. */ -static inline int check_stable_address_space(struct mm_struct *mm) +static inline vm_fault_t check_stable_address_space(struct mm_struct *mm) { if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags))) return VM_FAULT_SIGBUS; diff --git a/include/linux/swapops.h b/include/linux/swapops.h index 568a3553d918..22af9d8a84ae 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -4,6 +4,7 @@ #include #include +#include /* * swapcache pages are stored in the swapper_space radix tree. We want to @@ -134,7 +135,7 @@ static inline struct page *device_private_entry_to_page(swp_entry_t entry) return pfn_to_page(swp_offset(entry)); } -int device_private_entry_fault(struct vm_area_struct *vma, +vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, unsigned long addr, swp_entry_t entry, unsigned int flags, @@ -169,7 +170,7 @@ static inline struct page *device_private_entry_to_page(swp_entry_t entry) return NULL; } -static inline int device_private_entry_fault(struct vm_area_struct *vma, +static inline vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, unsigned long addr, swp_entry_t entry, unsigned int flags, diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h index e091f0a11b11..37c9eba75c98 100644 --- a/include/linux/userfaultfd_k.h +++ b/include/linux/userfaultfd_k.h @@ -28,7 +28,7 @@ #define UFFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) #define UFFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS) -extern int handle_userfault(struct vm_fault *vmf, unsigned long reason); +extern vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason); extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start, unsigned long src_start, unsigned long len, @@ -77,7 +77,8 @@ extern void userfaultfd_unmap_complete(struct mm_struct *mm, #else /* CONFIG_USERFAULTFD */ /* mm helpers */ -static inline int handle_userfault(struct vm_fault *vmf, unsigned long reason) +static inline vm_fault_t handle_userfault(struct vm_fault *vmf, + unsigned long reason) { return VM_FAULT_SIGBUS; } -- cgit v1.2.3