Re: [linux-safety] [PATCH] ext4/inode.c: remove dead stores in mpage_process_page()

On Thu, Oct 21, 2021 at 2:50 AM Nghia Le <[email protected]> wrote:
>
> The command "make clang-analyzer" detected dead stores.
>

Use present tense here. s/detected/detects/

> Removed the all the assignments io_end_size=0 to fix dead stores, as
> io_end_size is never read.
>

Use imperative here. So: s/Removed/Remove/

drop the first "the".

Maybe a better wording is:

Do not reset io_end_size to 0 in the current paths, as the function
exists on those paths without further using io_end_size.

... and the subject line could be "ext4: remove useless resetting
io_end_size in mpage_process_page()".

I hope this helps.

Lukas

> Signed-off-by: Nghia Le <[email protected]>
> ---
>  fs/ext4/inode.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 0f06305167d5..03efed2ed1ea 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2260,7 +2260,6 @@ static int mpage_process_page(struct mpage_da_data *mpd, struct page *page,
>                         mpd->map.m_len = 0;
>                         mpd->map.m_flags = 0;
>                         io_end_vec->size += io_end_size;
> -                       io_end_size = 0;
>
>                         err = mpage_process_page_bufs(mpd, head, bh, lblk);
>                         if (err > 0)
> @@ -2285,7 +2284,6 @@ static int mpage_process_page(struct mpage_da_data *mpd, struct page *page,
>         } while (lblk++, (bh = bh->b_this_page) != head);
>
>         io_end_vec->size += io_end_size;
> -       io_end_size = 0;
>         *map_bh = false;
>  out:
>         *m_lblk = lblk;
> --
> 2.25.1
>


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