Commit a1e09612 authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds

relay: nopage

Convert relay from nopage to fault.
Remove redundant vma range checks.
Switch from OOM to SIGBUS if the resource is not available.
Signed-off-by: 's avatarNick Piggin <>
Cc: Tom Zanussi <>
Signed-off-by: 's avatarAndrew Morton <>
Signed-off-by: 's avatarLinus Torvalds <>
parent f2df3f65
......@@ -37,37 +37,31 @@ static void relay_file_mmap_close(struct vm_area_struct *vma)
* nopage() vm_op implementation for relay file mapping.
* fault() vm_op implementation for relay file mapping.
static struct page *relay_buf_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
static int relay_buf_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
struct page *page;
struct rchan_buf *buf = vma->vm_private_data;
unsigned long offset = address - vma->vm_start;
pgoff_t pgoff = vmf->pgoff;
if (address > vma->vm_end)
return NOPAGE_SIGBUS; /* Disallow mremap */
if (!buf)
return NOPAGE_OOM;
return VM_FAULT_OOM;
page = vmalloc_to_page(buf->start + offset);
page = vmalloc_to_page(buf->start + (pgoff << PAGE_SHIFT));
if (!page)
return NOPAGE_OOM;
vmf->page = page;
if (type)
return page;
return 0;
* vm_ops for relay file mappings.
static struct vm_operations_struct relay_file_mmap_ops = {
.nopage = relay_buf_nopage,
.fault = relay_buf_fault,
.close = relay_file_mmap_close,
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