On 8/7/26 10:14 AM, Quentin Schulz wrote:
Hi Jonas,
On 8/3/26 8:43 PM, Jonas Karlman wrote:
Hardware of various vendors, but very notably Rockchip, often uses
32-bit registers where the upper 16-bit half of the register is a
write-enable mask for the lower half.
Add hw_bitfield.h with two macros: FIELD_PREP_WM16, and
FIELD_PREP_WM16_CONST. The latter is a version that can be used in
initializers, like FIELD_PREP_CONST.
Import hw_bitfield.h from Linux commit 21368fcbb124 ("bitmap: introduce
hardware-specific bitfield operations"), first introduced in v6.18-rc1.
This contains two changes compared to the Linux version:
- include of linux/limit.h was dropped
- use of const_true() in FIELD_PREP_WM16_CONST() was dropped
Acked-by: Quentin Schulz <[email protected]>
The content in this patch is as described in the commit log.
I'm wondering whether we should try to get include/linux/limit.h (and
include/vdso/limit.h) in. Also wondering if we could also get
const_true() in somehow.
No changes made to this file in Linux kernel since v6.18-rc1, so could
as well have said it's taken from 7.2-rc6 (which also means no missed
fixes).
I'll wait on Tom's Reviewed-by before merging this though since it's not
a straight import from the Linux kernel. I'm targeting the next branch
for this.
Read patch 2 again and you convinced me that this should rather go in
main, so will wait for Tom's R-b and target one of the 2026.10-rcX.
Sorry for the noise.
Cheers,
Quentin
