linux-kernel - Re: [PATCH] pcmcia/cm4000: remove useless variable tmp

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Message-ID: <CAK8P3a0LJETeKbQvs-EeQ1cF84gVO3JS75SOZYD0F+puWhi9=w@mail.gmail.com>
Date:   Tue, 21 Jan 2020 10:08:13 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Harald Welte <laforge@...monks.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pcmcia/cm4000: remove useless variable tmp

On Tue, Jan 21, 2020 at 9:50 AM Alex Shi <alex.shi@...ux.alibaba.com> wrote:
>
> No one care the value of 'tmp' in func cmm_write. better to remove it.

Hi Alex,

> @@ -1146,7 +1145,7 @@ static ssize_t cmm_write(struct file *filp, const char __user *buf,
>         set_cardparameter(dev);
>
>         /* dummy read, reset flag procedure received */
> -       tmp = inb(REG_FLAGS1(iobase));
> +       inb(REG_FLAGS1(iobase));

I think this may cause warnings on some architectures, when inb() is a macro
that just turns into a pointer dereference. You could write it as

     (void)inb(REG_FLAGS1(iobase));

which would not warn anywhere.

      Arnd