mm/shmem.c: use new return type vm_fault_t

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.

See commit 1c8f422059ae ("mm: change return type to vm_fault_t")

vmf_error() is the newly introduce inline function in 4.17-rc6.

Link: http://lkml.kernel.org/r/20180521202410.GA17912@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 9a1b553..2b686e3 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1947,14 +1947,14 @@ static int synchronous_wake_function(wait_queue_entry_t *wait, unsigned mode, in
        return ret;
 }
 
-static int shmem_fault(struct vm_fault *vmf)
+static vm_fault_t shmem_fault(struct vm_fault *vmf)
 {
        struct vm_area_struct *vma = vmf->vma;
        struct inode *inode = file_inode(vma->vm_file);
        gfp_t gfp = mapping_gfp_mask(inode->i_mapping);
        enum sgp_type sgp;
-       int error;
-       int ret = VM_FAULT_LOCKED;
+       int err;
+       vm_fault_t ret = VM_FAULT_LOCKED;
 
        /*
         * Trinity finds that probing a hole which tmpfs is punching can
@@ -2022,10 +2022,10 @@ static int shmem_fault(struct vm_fault *vmf)
        else if (vma->vm_flags & VM_HUGEPAGE)
                sgp = SGP_HUGE;
 
-       error = shmem_getpage_gfp(inode, vmf->pgoff, &vmf->page, sgp,
+       err = shmem_getpage_gfp(inode, vmf->pgoff, &vmf->page, sgp,
                                  gfp, vma, vmf, &ret);
-       if (error)
-               return ((error == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS);
+       if (err)
+               return vmf_error(err);
        return ret;
 }