[PATCH v1 1/1] ACPI: bus: Reduce runtime memory footprint of struct acpi_device
From: Andy Shevchenko
Date: Wed Sep 09 2026 - 14:56:50 EST
The ACPI handler is heavily used by the ACPI code. Making it as
the first member in the struct acpi_device reduces code size.
For instance, the drivers/acpi/scan.o (with `make allyesconfig`)
gives this statistics:
add/remove: 0/0 grow/shrink: 3/8 up/down: 50/-169 (-119)
Function old new delta
acpi_device_add 2294 2319 +25
acpi_add_single_object 6523 6544 +21
acpi_dev_get_next_consumer_dev 602 606 +4
acpi_tie_acpi_dev 169 165 -4
acpi_scan_drop_device 319 315 -4
acpi_dev_clear_dependencies 1151 1147 -4
acpi_bus_attach 2898 2894 -4
acpi_dma_get_range 1420 1415 -5
acpi_init_device_object 5497 5485 -12
acpi_bus_check_add 1940 1923 -17
acpi_device_hotplug 3407 3288 -119
Total: Before=77509, After=77390, chg -0.15%
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
include/acpi/acpi_bus.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a10a591c18b2..64ae66ca456e 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -435,9 +435,9 @@ struct acpi_device_software_nodes {
/* Device */
struct acpi_device {
+ acpi_handle handle; /* no handle for fixed hardware */
u32 pld_crc;
int device_type;
- acpi_handle handle; /* no handle for fixed hardware */
struct fwnode_handle fwnode;
struct list_head wakeup_list;
struct list_head del_list;
--
2.50.1