linux-kernel - Re: [PATCH v4 1/3] mm: get_user_pages: consolidate error handling

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Message-Id: <20181008170525.62d1a910f7811d7c66a8c34c@linux-foundation.org>
Date:   Mon, 8 Oct 2018 17:05:25 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     john.hubbard@...il.com
Cc:     Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Christopher Lameter <cl@...ux.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Jan Kara <jack@...e.cz>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v4 1/3] mm: get_user_pages: consolidate error handling

On Mon,  8 Oct 2018 14:16:21 -0700 john.hubbard@...il.com wrote:

> An upcoming patch requires a way to operate on each page that
> any of the get_user_pages_*() variants returns.
> 
> In preparation for that, consolidate the error handling for
> __get_user_pages(). This provides a single location (the "out:" label)
> for operating on the collected set of pages that are about to be returned.
> 
> As long every use of the "ret" variable is being edited, rename
> "ret" --> "err", so that its name matches its true role.
> This also gets rid of two shadowed variable declarations, as a
> tiny beneficial a side effect.

Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>

`i' is a pretty crappy identifier as well, but we'll live.