mm: convert insert_pfn() to vm_fault_t

All callers convert its errno into a vm_fault_t, so convert it to return a
vm_fault_t directly.

Link: http://lkml.kernel.org/r/20180828145728.11873-11-willy@infradead.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index a016fd1..6abc74f 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1520,19 +1520,16 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL(vm_insert_page);
 
-static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
+static vm_fault_t insert_pfn(struct vm_area_struct *vma, unsigned long addr,
                        pfn_t pfn, pgprot_t prot, bool mkwrite)
 {
        struct mm_struct *mm = vma->vm_mm;
-       int retval;
        pte_t *pte, entry;
        spinlock_t *ptl;
 
-       retval = -ENOMEM;
        pte = get_locked_pte(mm, addr, &ptl);
        if (!pte)
-               goto out;
-       retval = -EBUSY;
+               return VM_FAULT_OOM;
        if (!pte_none(*pte)) {
                if (mkwrite) {
                        /*
@@ -1565,11 +1562,9 @@ out_mkwrite:
        set_pte_at(mm, addr, pte, entry);
        update_mmu_cache(vma, addr, pte); /* XXX: why not for insert_page? */
 
-       retval = 0;
 out_unlock:
        pte_unmap_unlock(pte, ptl);
-out:
-       return retval;
+       return VM_FAULT_NOPAGE;
 }
 
 /**
@@ -1593,8 +1588,6 @@ out:
 vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
                        unsigned long pfn, pgprot_t pgprot)
 {
-       int err;
-
        /*
         * Technically, architectures with pte_special can avoid all these
         * restrictions (same for remap_pfn_range).  However we would like
@@ -1615,15 +1608,8 @@ vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
 
        track_pfn_insert(vma, &pgprot, __pfn_to_pfn_t(pfn, PFN_DEV));
 
-       err = insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot,
+       return insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot,
                        false);
-
-       if (err == -ENOMEM)
-               return VM_FAULT_OOM;
-       if (err < 0 && err != -EBUSY)
-               return VM_FAULT_SIGBUS;
-
-       return VM_FAULT_NOPAGE;
 }
 EXPORT_SYMBOL(vmf_insert_pfn_prot);
 
@@ -1703,7 +1689,7 @@ static vm_fault_t __vm_insert_mixed(struct vm_area_struct *vma,
                page = pfn_to_page(pfn_t_to_pfn(pfn));
                err = insert_page(vma, addr, page, pgprot);
        } else {
-               err = insert_pfn(vma, addr, pfn, pgprot, mkwrite);
+               return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
        }
 
        if (err == -ENOMEM)