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

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Date:   Tue, 26 Nov 2019 17:33:03 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Iurii Zaikin <yzaikin@...gle.com>, brendanhiggins@...gle.com,
        tytso@....edu, geert@...ux-m68k.org
Cc:     linux-ext4@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com,
        "skh >> Shuah Khan" <skhan@...uxfoundation.org>
Subject: Re: [PATCH] fs/ext4/inode-test: Fix inode test on 32 bit platforms.

On 11/26/19 5:10 PM, Iurii Zaikin 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.
> 
> Signed-off-by: Iurii Zaikin <yzaikin@...gle.com>

Thanks for sending the patch quickly.

Please add Reported-by for Geert and also include the error he is
seeing in the commit log.
> ---
>   fs/ext4/inode-test.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/inode-test.c b/fs/ext4/inode-test.c
> index 92a9da1774aa..bbce1c328d85 100644
> --- a/fs/ext4/inode-test.c
> +++ b/fs/ext4/inode-test.c
> @@ -25,7 +25,7 @@
>    * For constructing the negative timestamp lower bound value.
>    * binary: 10000000 00000000 00000000 00000000
>    */
> -#define LOWER_MSB_1 (-0x80000000L)
> +#define LOWER_MSB_1 (-(UPPER_MSB_0) - 1L)  /* avoid overflow */
>   /*
>    * For constructing the negative timestamp upper bound value.
>    * binary: 11111111 11111111 11111111 11111111
> --
> 2.24.0.432.g9d3f5f5b63-goog
> 

thanks,
-- Shuah