[PATCH 0/9] Drop unnecessary static

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4 messages, 3 authors, 2017-06-27 · open the first message on its own page

[PATCH 0/9] Drop unnecessary static

From: Julia Lawall <hidden>
Date: 2017-05-04 20:36:32

These patches fix cases where there is a static on a local variable, but
the variable is either first initialized or never used, on every possible
execution path through the function.  The static has no benefit, and
dropping it reduces the code size.

---

 drivers/block/drbd/drbd_nl.c            |    2 +-
 drivers/clocksource/timer-fttmr010.c    |    2 +-
 drivers/iio/accel/hid-sensor-accel-3d.c |    2 +-
 drivers/mfd/max8925-i2c.c               |    2 +-
 drivers/mfd/twl4030-irq.c               |    2 +-
 drivers/mtd/chips/cfi_cmdset_0020.c     |    2 +-
 drivers/mtd/maps/physmap_of_gemini.c    |    2 +-
 drivers/power/supply/axp20x_usb_power.c |    2 +-
 drivers/regulator/palmas-regulator.c    |    2 +-
 9 files changed, 9 insertions(+), 9 deletions(-)

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[PATCH 7/9] iio: hid-sensor-accel-3d: Drop unnecessary static

From: Julia Lawall <hidden>
Date: 2017-05-04 20:35:14

Drop static on a local variable, when the variable is initialized before
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
   3879     512       8    4399    112f drivers/iio/accel/hid-sensor-accel-3d.o

after:
   text    data     bss     dec     hex filename
   3863     512       0    4375    1117 drivers/iio/accel/hid-sensor-accel-3d.o

Signed-off-by: Julia Lawall <redacted>

---
 drivers/iio/accel/hid-sensor-accel-3d.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c b/drivers/iio/accel/hid-sensor-accel-3d.c
index 43a6cb0..2238a26 100644
--- a/drivers/iio/accel/hid-sensor-accel-3d.c
+++ b/drivers/iio/accel/hid-sensor-accel-3d.c

@@ -347,7 +347,7 @@ static int accel_3d_parse_report(struct platform_device *pdev,
 static int hid_accel_3d_probe(struct platform_device *pdev)
 {
 	int ret = 0;
-	static const char *name;
+	const char *name;
 	struct iio_dev *indio_dev;
 	struct accel_3d_state *accel_state;
 	const struct iio_chan_spec *channel_spec;

Re: [PATCH 7/9] iio: hid-sensor-accel-3d: Drop unnecessary static

From: Jonathan Cameron <jic23@kernel.org>
Date: 2017-05-07 22:26:06

On 04/05/17 21:10, Julia Lawall wrote:

Drop static on a local variable, when the variable is initialized before
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
   3879     512       8    4399    112f drivers/iio/accel/hid-sensor-accel-3d.o

after:
   text    data     bss     dec     hex filename
   3863     512       0    4375    1117 drivers/iio/accel/hid-sensor-accel-3d.o

Signed-off-by: Julia Lawall <redacted>

Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.

Thanks,

Jonathan

quoted hunk

---
 drivers/iio/accel/hid-sensor-accel-3d.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c b/drivers/iio/accel/hid-sensor-accel-3d.c
index 43a6cb0..2238a26 100644
--- a/drivers/iio/accel/hid-sensor-accel-3d.c
+++ b/drivers/iio/accel/hid-sensor-accel-3d.c

@@ -347,7 +347,7 @@ static int accel_3d_parse_report(struct platform_device *pdev,
 static int hid_accel_3d_probe(struct platform_device *pdev)
 {
 	int ret = 0;
-	static const char *name;
+	const char *name;
 	struct iio_dev *indio_dev;
 	struct accel_3d_state *accel_state;
 	const struct iio_chan_spec *channel_spec;

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Re: [PATCH 0/9] Drop unnecessary static

From: Kees Cook <hidden>
Date: 2017-06-27 23:47:44

On Thu, May 4, 2017 at 1:10 PM, Julia Lawall [off-list ref] wrote:

These patches fix cases where there is a static on a local variable, but
the variable is either first initialized or never used, on every possible
execution path through the function.  The static has no benefit, and
dropping it reduces the code size.

---

 drivers/block/drbd/drbd_nl.c            |    2 +-
 drivers/clocksource/timer-fttmr010.c    |    2 +-
 drivers/iio/accel/hid-sensor-accel-3d.c |    2 +-
 drivers/mfd/max8925-i2c.c               |    2 +-
 drivers/mfd/twl4030-irq.c               |    2 +-
 drivers/mtd/chips/cfi_cmdset_0020.c     |    2 +-
 drivers/mtd/maps/physmap_of_gemini.c    |    2 +-
 drivers/power/supply/axp20x_usb_power.c |    2 +-
 drivers/regulator/palmas-regulator.c    |    2 +-
 9 files changed, 9 insertions(+), 9 deletions(-)

It looks like most of these were taken. I pinged the other three. Thanks!

-Kees

-- 
Kees Cook
Pixel Security

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