linux-kernel - Re: [PATCH] docs: fault-injection: fix non-working usage of negative values

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Date:   Thu, 3 Jun 2021 17:35:39 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] docs: fault-injection: fix non-working usage of negative
 values

Yeah, I also assume that it used to work at some time. Didn't bother to
investigate, though.

> The code uses debugfs_create_atomic_t(), and atomic_t is signed, so
> I'd expect negative numbers to work.

In debugfs, it is all cast from unsigned long long to something. Check
simple_attr_write() where the value is obtained with kstrtoull. The code
fix would be to not use simple_attr, I think. I opted for the doc fix.

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