linux-kernel - Re: [PATCH] fs/ntfs3: Remove unused variable cnt in ntfs_security

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Date:   Mon, 16 Aug 2021 14:56:11 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] fs/ntfs3: Remove unused variable cnt in ntfs_security_init()

On Mon, Aug 16, 2021 at 12:30 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Clang warns:
>
> fs/ntfs3/fsntfs.c:1874:9: warning: variable 'cnt' set but not used
> [-Wunused-but-set-variable]
>         size_t cnt, off;
>                ^
> 1 warning generated.
>
> It is indeed unused so remove it.
>
> Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")

I went back to the original patches to see if this was ever used;
since v2 (when the ntfs3 driver was split up) it was not. I triple
checked the v1 as well.
v2: https://lore.kernel.org/lkml/caddbe41eaef4622aab8bac24934eed1@paragon-software.com/
v1: https://dl.paragon-software.com/ntfs3/ntfs3.patch
I don't think there's a logic error here.

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
>  fs/ntfs3/fsntfs.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
> index 92140050fb6c..c6599c514acf 100644
> --- a/fs/ntfs3/fsntfs.c
> +++ b/fs/ntfs3/fsntfs.c
> @@ -1871,7 +1871,7 @@ int ntfs_security_init(struct ntfs_sb_info *sbi)
>         struct ATTRIB *attr;
>         struct ATTR_LIST_ENTRY *le;
>         u64 sds_size;
> -       size_t cnt, off;
> +       size_t off;
>         struct NTFS_DE *ne;
>         struct NTFS_DE_SII *sii_e;
>         struct ntfs_fnd *fnd_sii = NULL;
> @@ -1946,7 +1946,6 @@ int ntfs_security_init(struct ntfs_sb_info *sbi)
>         sbi->security.next_off =
>                 Quad2Align(sds_size - SecurityDescriptorsBlockSize);
>
> -       cnt = 0;
>         off = 0;
>         ne = NULL;
>
> @@ -1964,8 +1963,6 @@ int ntfs_security_init(struct ntfs_sb_info *sbi)
>                 next_id = le32_to_cpu(sii_e->sec_id) + 1;
>                 if (next_id >= sbi->security.next_id)
>                         sbi->security.next_id = next_id;
> -
> -               cnt += 1;
>         }
>
>         sbi->security.ni = ni;
>
> base-commit: 96b18047a7172037ff4206720f4e889670030b41
> --
> 2.33.0.rc2
>
> --
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-- 
Thanks,
~Nick Desaulniers