linux-kernel - [PATCH] misc: cxl: Change return type to vm_fault

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Date:   Tue, 17 Apr 2018 20:23:54 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     fbarrat@...ux.vnet.ibm.com, andrew.donnellan@....ibm.com,
        arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        willy@...radead.org
Subject: [PATCH] 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 -> 1c8f422059ae ("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@...il.com>
---
 drivers/misc/cxl/context.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index 7ff315a..c6ec872 100644
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -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 = {
--
1.9.1