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

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Message-Id: <efed6e3d-b40b-9a96-4e7a-f5409c03c54f@linux.ibm.com>
Date:   Fri, 11 May 2018 12:24:29 +0200
From:   Frederic Barrat <fbarrat@...ux.ibm.com>
To:     Souptick Joarder <jrdr.linux@...il.com>,
        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: Re: [PATCH] misc: cxl: Change return type to vm_fault_t



Le 17/04/2018 à 16:53, Souptick Joarder a écrit :
> 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>
> ---

It looks ok, and it passed some basic testing.

Acked-by: Frederic Barrat <fbarrat@...ux.vnet.ibm.com>

   Fred


>   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
>