netdev - Re: [PATCH net-next 01/11] atm: horizon: shut up clang null pointer arithmetic warning

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Message-Id: <20201027035558.16864-1-xie.he.0141@gmail.com>
Date:   Mon, 26 Oct 2020 20:55:58 -0700
From:   Xie He <xie.he.0141@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Xie He <xie.he.0141@...il.com>, Chas Williams <3chas3@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH net-next 01/11] atm: horizon: shut up clang null pointer arithmetic warning

> -  for (mem = (HDW *) memmap; mem < (HDW *) (memmap + 1); ++mem)
> +  for (mem = (HDW *) memmap; mem < (HDW *) ((uintptr_t)memmap + 1); ++mem)

Note that these two lines are semantically different. In the first line,
"+ 1" moves the pointer by (sizeof memmap) bytes. However in the second
line, "+ 1" moves the pointer by only 1 byte.

This driver is old, but let's still keep its code correct!