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Date:   Thu, 30 Aug 2018 16:33:52 -0700
From:   Andrew Morton <>
To:     Souptick Joarder <>
Subject: Re: [PATCH v2] fs: Convert return type int to vm_fault_t

On Thu, 30 Aug 2018 22:55:47 +0530 Souptick Joarder <> wrote:

> Return type for fault handlers  in ext4 and nilfs are
> changed to use vm_fault_t.
> Return type of block_page_mkwrite() is changed from
> int to vm_fault_t. The function signature of
> block_page_mkwrite() is changed to add one new parameter
> int *err. This will provide a way for caller functions
> to get error value along with return value and use it
> further.
> Return type of block_page_mkwrite_return() is also changed
> to use new vm_fault_t type.
> --- a/fs/nilfs2/file.c
> +++ b/fs/nilfs2/file.c
> @@ -51,13 +51,14 @@ int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
>  	return err;
>  }
> -static int nilfs_page_mkwrite(struct vm_fault *vmf)
> +static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf)

nilfs_page_mkwrite() already has return type vm_fault_t in Linus's
kernel, due to the now-merged
fs-nilfs2-adding-new-return-type-vm_fault_t.patch.  Looks like a simple

I'm beginning to feel vm_fault_t exhaustion.  Please remind me what
benefit we're going to get out of all this churn?

> ...

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