On Mon, 15 Feb 2021, Denis Efremov wrote:
> Hi,
>
> I wrote a simple rule (swap.cocci):
>
> virtual patch
>
> @depends on patch@
> identifier tmp;
> expression a, b;
> type T;
> @@
>
> (
> - T tmp;
> |
> - T tmp = 0;
> |
> - T *tmp = NULL;
> )
> ... when != tmp
> - tmp = a;
> - a = b;
> - b = tmp;
> + swap(a, b);
> ... when != tmp
>
> I would expect it to remove a local variable only if there is a match
> with swap template.
>
> However, it generates "partial" patch on 5.11 linux code:
> $ spatch --version
> spatch version 1.0.8-00201-g267f9cf8cc82 compiled with OCaml version 4.11.1
> $ spatch -D patch --sp-file swap.cocci mm/filemap.c
> --- mm/filemap.c
> +++ /tmp/cocci-output-445786-88aa66-filemap.c
> @@ -2348,7 +2348,7 @@ static int generic_file_buffered_read_ge
> struct file_ra_state *ra = &filp->f_ra;
> pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;
> pgoff_t last_index = (iocb->ki_pos + iter->count + PAGE_SIZE-1) >>
> PAGE_SHIFT;
> - int i, j, nr_got, err = 0;
> + int i, nr_got, err = 0;
>
> nr = min_t(unsigned long, last_index - index, nr);
> find_page:
>
> How can I improve the rule?
Strange. It shouldn't do that.
julia
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