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Message-Id: <20171221002704.20824-1-linux@rasmusvillemoes.dk>
Date: Thu, 21 Dec 2017 01:27:04 +0100
From: Rasmus Villemoes <linux@...musvillemoes.dk>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpio: reduce descriptor validation code size
While we do need macros to be able to return from the "calling"
function, we can still factor the checks done by the VALIDATE_DESC*
macros into a real helper function. This reduces the backslashtitis,
avoids duplicating the logic in the two macros and saves about 1K of
generated code:
$ scripts/bloat-o-meter drivers/gpio/gpiolib.o.{0,1}
add/remove: 1/0 grow/shrink: 0/15 up/down: 104/-1281 (-1177)
Function old new delta
validate_desc - 104 +104
gpiod_set_value 192 135 -57
gpiod_set_raw_value 125 67 -58
gpiod_direction_output 412 351 -61
gpiod_set_value_cansleep 150 70 -80
gpiod_set_raw_value_cansleep 132 52 -80
gpiod_get_raw_value 139 54 -85
gpiod_set_debounce 226 140 -86
gpiod_direction_output_raw 124 38 -86
gpiod_get_value 161 74 -87
gpiod_cansleep 126 39 -87
gpiod_get_raw_value_cansleep 130 39 -91
gpiod_get_value_cansleep 152 59 -93
gpiod_is_active_low 128 33 -95
gpiod_request 299 184 -115
gpiod_direction_input 386 266 -120
Total: Before=25460, After=24283, chg -4.62%
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
drivers/gpio/gpiolib.c | 57 ++++++++++++++++++++++++--------------------------
1 file changed, 27 insertions(+), 30 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index aad84a6306c4..adbaa19bffe4 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2165,40 +2165,37 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
* macro to avoid endless duplication. If the desc is NULL it is an
* optional GPIO and calls should just bail out.
*/
+static int validate_desc(const struct gpio_desc *desc, const char *func)
+{
+ if (!desc)
+ return 0;
+ if (IS_ERR(desc)) {
+ pr_warn("%s: invalid GPIO (errorpointer)\n", func);
+ return PTR_ERR(desc);
+ }
+ if (!desc->gdev) {
+ pr_warn("%s: invalid GPIO (no device)\n", func);
+ return -EINVAL;
+ }
+ if (!desc->gdev->chip) {
+ dev_warn(&desc->gdev->dev,
+ "%s: backing chip is gone\n", func);
+ return 0;
+ }
+ return 1;
+}
+
#define VALIDATE_DESC(desc) do { \
- if (!desc) \
- return 0; \
- if (IS_ERR(desc)) { \
- pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
- return PTR_ERR(desc); \
- } \
- if (!desc->gdev) { \
- pr_warn("%s: invalid GPIO (no device)\n", __func__); \
- return -EINVAL; \
- } \
- if ( !desc->gdev->chip ) { \
- dev_warn(&desc->gdev->dev, \
- "%s: backing chip is gone\n", __func__); \
- return 0; \
- } } while (0)
+ int __valid = validate_desc(desc, __func__); \
+ if (__valid <= 0) \
+ return __valid; \
+ } while (0)
#define VALIDATE_DESC_VOID(desc) do { \
- if (!desc) \
- return; \
- if (IS_ERR(desc)) { \
- pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
+ int __valid = validate_desc(desc, __func__); \
+ if (__valid <= 0) \
return; \
- } \
- if (!desc->gdev) { \
- pr_warn("%s: invalid GPIO (no device)\n", __func__); \
- return; \
- } \
- if (!desc->gdev->chip) { \
- dev_warn(&desc->gdev->dev, \
- "%s: backing chip is gone\n", __func__); \
- return; \
- } } while (0)
-
+ } while (0)
int gpiod_request(struct gpio_desc *desc, const char *label)
{
--
2.11.0
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