Re: [PATCH v2] nvdimm/btt: fix sequence endian in btt_log_read error print

[Alison Schofield <alison.schofield@intel.com>]

On Wed, Jun 24, 2026 at 04:06:02PM +0100, Ben Dooks wrote:
> The error reporting in btt_log_read() prints sequence numbers out
> from the log which are stored in little endian without any endian
> conversion. Make sure these are passed throuhg endian convesion
> before going to the kernel console so the user sees the correct
> sequence number and to avoid any warnings from sparse due to
> endian conversion.
> 
> Fix the following (prototype) sparse warnings:
> drivers/nvdimm/btt.c:342:17: warning: incorrect type in argument 5 (different base types)
> drivers/nvdimm/btt.c:342:17:    expected int
> drivers/nvdimm/btt.c:342:17:    got restricted __le32 [usertype] seq
> drivers/nvdimm/btt.c:342:17: warning: incorrect type in argument 6 (different base types)
> drivers/nvdimm/btt.c:342:17:    expected int
> drivers/nvdimm/btt.c:342:17:    got restricted __le32 [usertype] seq
> 

Hi Ben,

I'll wait on a v3 of this one that addresses the Sashiko review
feedback. Thanks!

-- Alison



> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
> ---
> v2: reworded commnit messae
> ---
>  drivers/nvdimm/btt.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
> index 7e1112960d7f..e9d548442884 100644
> --- a/drivers/nvdimm/btt.c
> +++ b/drivers/nvdimm/btt.c
> @@ -341,8 +341,9 @@ static int btt_log_read(struct arena_info *arena, u32 lane,
>  	if (old_ent < 0 || old_ent > 1) {
>  		dev_err(to_dev(arena),
>  				"log corruption (%d): lane %d seq [%d, %d]\n",
> -				old_ent, lane, log.ent[arena->log_index[0]].seq,
> -				log.ent[arena->log_index[1]].seq);
> +				old_ent, lane,
> +				le32_to_cpu(log.ent[arena->log_index[0]].seq),
> +				le32_to_cpu(log.ent[arena->log_index[1]].seq));
>  		/* TODO set error state? */
>  		return -EIO;
>  	}
> -- 
> 2.37.2.352.g3c44437643
>