linux-ext4 - Re: [PATCH] fs/ext4/inode-test: Fix inode test on 32 bit platforms.

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Date:   Wed, 27 Nov 2019 08:29:53 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Iurii Zaikin <yzaikin@...gle.com>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Theodore Tso <tytso@....edu>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, kunit-dev@...glegroups.com
Subject: Re: [PATCH] fs/ext4/inode-test: Fix inode test on 32 bit platforms.

On Wed, Nov 27, 2019 at 1:37 AM Iurii Zaikin <yzaikin@...gle.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@...ux-m68k.org
> Signed-off-by: Iurii Zaikin <yzaikin@...gle.com>

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

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

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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