Re: [PATCH 1/9] mtd: cfi_cmdset_0020: Drop unnecessary static

Brian Norris
2017-05-11T18:49:45Z

On Thu, May 04, 2017 at 10:10:46PM +0200, Julia Lawall wrote:
> Drop static on a local variable, when the variable is initialized before
> any use on every possible execution path through the function. The static
> has no benefit, and dropping it reduces the code size.
>
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @bad exists@
> position p;
> identifier x;
> type T;
> @@
>
> static T x@p;
> ...
> x = <+...x...+>
>
> @@
> identifier x;
> expression e;
> type T;
> position p != bad.p;
> @@
>
> -static
> T x@p;
> ... when != x
> when strict
> ?x = e;
> // </smpl>
>
> The change in code size is indicates by the following output from the size
> command.
>
> before:
> text data bss dec hex filename
> 16671 48 16 16735 415f drivers/mtd/chips/cfi_cmdset_0020.o
>
> after:
> text data bss dec hex filename
> 16639 48 8 16695 4137 drivers/mtd/chips/cfi_cmdset_0020.o
>
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

Applied patches 1 and 2 to l2-mtd.git/next, for 4.13.