[PATCH 2/2] UBI: support per-device wear-leveling threshold

[Zhihao Cheng]

在 2026/7/23 10:02, Ran Hongyun 写道:
> The UBI wear-leveling threshold (CONFIG_MTD_UBI_WL_THRESHOLD) is
> currently a compile-time constant shared by all UBI devices. When a
> single kernel image must support multiple NAND flashes with different
> erase lifetimes, one global threshold cannot suit all devices.
> 
> Add a per-device configurable wl_threshold parameter:
> 
>    - UAPI: add __s32 wl_threshold to struct ubi_attach_req, carved
>      from the existing padding.
> 
>    - Module parameter: ubi.mtd gains a new optional token
>      "wl_threshold":
>        ubi.mtd=0,0,0,0,0,0,256  ubi.mtd=1,0,0,0,0,0,4096
> 
> 0 means "use the kernel default", the accepted range is
> 2-65536.
> 
> Signed-off-by: Ran Hongyun <ranhongyun1 at huawei.com>
> ---
>   drivers/mtd/ubi/build.c      | 43 ++++++++++++++++++++++++++++++------
>   drivers/mtd/ubi/cdev.c       |  2 +-
>   drivers/mtd/ubi/fastmap-wl.c |  8 +++----
>   drivers/mtd/ubi/ubi.h        | 21 +++++++++++++++++-
>   drivers/mtd/ubi/wl.c         | 39 ++++++++------------------------
>   include/uapi/mtd/ubi-user.h  | 10 ++++++++-
>   6 files changed, 79 insertions(+), 44 deletions(-)
> 

Reviewed-by: Zhihao Cheng <chengzhihao1 at huawei.com>