[PATCH v4 3/3] iio: adc: ltc2497: reorder struct members to fix memory holes

From: Yusuf Alper Bilgin
Date: Fri Aug 15 2025 - 06:07:12 EST


Reorder members in the `ltc2497_chip_info` and `ltc2497core_driverdata`
structs to eliminate memory holes identified by the `pahole` tool.

Confirm via the `bloat-o-meter` that this change has no significant
impact on the final code size:

| Object File | Total Size Change |
|-----------------|-------------------|
| ltc2497-core.o | 0 (0.00%) |
| ltc2497.o | +2 (+0.10%) |
| ltc2496.o | 0 (0.00%) |

Signed-off-by: Yusuf Alper Bilgin <y.alperbilgin@xxxxxxxxx>
---
drivers/iio/adc/ltc2497.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h
index dfe2d5c30017adeb3f17e57fc5bf1e0e792ff30f..48e9f74870ab489b5df6e69a39446610c6a72b93 100644
--- a/drivers/iio/adc/ltc2497.h
+++ b/drivers/iio/adc/ltc2497.h
@@ -5,8 +5,8 @@
#define LTC2497_CONVERSION_TIME_MS 150ULL

struct ltc2497_chip_info {
- u32 resolution;
const char *name;
+ u32 resolution;
/*
* Represents the datasheet constant from the temperature formula:
* T_Kelvin = (DATAOUT * Vref) / temp_scale, where Vref is in Volts.
@@ -20,15 +20,15 @@ struct ltc2497_chip_info {
};

struct ltc2497core_driverdata {
- struct regulator *ref;
- ktime_t time_prev;
/* lock to protect against multiple access to the device */
struct mutex lock;
+ struct regulator *ref;
+ ktime_t time_prev;
const struct ltc2497_chip_info *chip_info;
- u8 addr_prev;
int (*result_and_measure)(struct ltc2497core_driverdata *ddata,
u8 address, int *val);
enum iio_chan_type chan_type_prev;
+ u8 addr_prev;
};

int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev);

--
2.43.0