Messages in this thread | | | From | Linus Walleij <> | Date | Wed, 2 Aug 2017 10:25:50 +0200 | Subject | Re: [PATCH] pinctrl: bcm2835: constify gpio_chip structure |
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On Tue, Jul 11, 2017 at 8:03 PM, Gustavo A. R. Silva <garsilva@embeddedor.com> wrote:
> This structure is only used to copy into other structure, so declare > it as const. > > This issue was detected using Coccinelle and the following semantic patch: > > @r disable optional_qualifier@ > identifier i; > position p; > @@ > static struct gpio_chip i@p = { ... }; > > @ok@ > identifier r.i; > expression e; > position p; > @@ > e = i@p; > > @bad@ > position p != {r.p,ok.p}; > identifier r.i; > struct gpio_chip e; > @@ > e@i@p > > @depends on !bad disable optional_qualifier@ > identifier r.i; > @@ > static > +const > struct gpio_chip i = { ... }; > > In the following log you can see a significant difference in the code size > and data segment, hence in the dec segment. This log is the output > of the size command, before and after the code change: > > before: > text data bss dec hex filename > 18958 9000 128 28086 6db6 drivers/pinctrl/bcm/pinctrl-bcm2835.o > > after: > text data bss dec hex filename > 18764 8912 128 27804 6c9c drivers/pinctrl/bcm/pinctrl-bcm2835.o > > Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Patch applied with Eric's ACK.
Yours, Linus Walleij
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