Received-SPF: pass (google.com: best guess record for domain of linux-ext4-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20191127003715.108479-1-yzaikin@google.com>
In-Reply-To: <20191127003715.108479-1-yzaikin@google.com>
From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Wed, 27 Nov 2019 08:29:53 +0100
Message-ID: <CAMuHMdUVzwtZG1C_nw=xpRfwFOZ4GnOcmoN+b30_LkXzN29PKw@mail.gmail.com>
Subject: Re: [PATCH] fs/ext4/inode-test: Fix inode test on 32 bit platforms.
To:     Iurii Zaikin <yzaikin@google.com>
Cc:     Shuah Khan <skhan@linuxfoundation.org>,
        Brendan Higgins <brendanhiggins@google.com>,
        Theodore Tso <tytso@mit.edu>,
        Ext4 Developers List <linux-ext4@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>, kunit-dev@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Sender: linux-ext4-owner@vger.kernel.org
Precedence: bulk

On Wed, Nov 27, 2019 at 1:37 AM Iurii Zaikin <yzaikin@google.com> wrote:
> Fixes the issue caused by the fact that in C in the expression
> of the form -1234L only 1234L is the actual literal, the unary
> minus is an operation applied to the literal. Which means that
> to express the lower bound for the type one has to negate the
> upper bound and subtract 1.
> Original error:
> Expected test_data[i].expected.tv_sec == timestamp.tv_sec, but
> test_data[i].expected.tv_sec == -2147483648
> timestamp.tv_sec == 2147483648
> 1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits: msb:1
> lower_bound:1 extra_bits: 0
> Expected test_data[i].expected.tv_sec == timestamp.tv_sec, but
> test_data[i].expected.tv_sec == 2147483648
> timestamp.tv_sec == 6442450944
> 2038-01-19 Lower bound of 32bit <0 timestamp, lo extra sec bit on:
> msb:1 lower_bound:1 extra_bits: 1
> Expected test_data[i].expected.tv_sec == timestamp.tv_sec, but
> test_data[i].expected.tv_sec == 6442450944
> timestamp.tv_sec == 10737418240
> 2174-02-25 Lower bound of 32bit <0 timestamp, hi extra sec bit on:
> msb:1 lower_bound:1 extra_bits: 2
> not ok 1 - inode_test_xtimestamp_decoding
> not ok 1 - ext4_inode_test
>
> Reported-by: Geert Uytterhoeven geert@linux-m68k.org
> Signed-off-by: Iurii Zaikin <yzaikin@google.com>

Thanks, test succeeds (on m68k, arm32, and arm64)!

Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds