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misc: cxl: Change return type to 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.

Reference id -> 1c8f422059 ("mm: change return type to
vm_fault_t")

previously cxl_mmap_fault returns VM_FAULT_NOPAGE as
default value irrespective of vm_insert_pfn() return
value. This bug is fixed with new vmf_insert_pfn()
which will return VM_FAULT_ type based on err.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Souptick Joarder 2018-04-17 20:23:54 +05:30 committed by Greg Kroah-Hartman
parent 361f2ddbb0
commit a5a0b45eda
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/misc/cxl/context.c
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@ -128,11 +128,12 @@ void cxl_context_set_mapping(struct cxl_context *ctx,
mutex_unlock(&ctx->mapping_lock);
}
static int cxl_mmap_fault(struct vm_fault *vmf)
static vm_fault_t cxl_mmap_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct cxl_context *ctx = vma->vm_file->private_data;
u64 area, offset;
vm_fault_t ret;
offset = vmf->pgoff << PAGE_SHIFT;
@ -169,11 +170,11 @@ static int cxl_mmap_fault(struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
}
vm_insert_pfn(vma, vmf->address, (area + offset) >> PAGE_SHIFT);
ret = vmf_insert_pfn(vma, vmf->address, (area + offset) >> PAGE_SHIFT);
mutex_unlock(&ctx->status_mutex);
return VM_FAULT_NOPAGE;
return ret;
}
static const struct vm_operations_struct cxl_mmap_vmops = {