Re: [PATCH v2 4/5] cxl/region: Start unmapped poison scan at the committed decoder boundary

[Dave Jiang]

On 7/2/26 2:08 AM, Richard Cheng wrote:
> poison_by_decoder() stops at the last committed decoder and records the
> handoff in ctx->offset, but cxl_get_poison_unmapped() ignores it and
> starts after the highest DPA allocation instead. Allocation exist for
> uncommitted decoders too, so their DPA is skipped by both phases and
> poison there is never reported. Resume the scan at ctx->offset, and scan
> later partitions in full, restoring the pre-rewrite behavior.
> 
> Fixes: be5cbd084027 ("cxl: Kill enum cxl_decoder_mode")
> Signed-off-by: Richard Cheng <icheng@xxxxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>

> ---
> Changelog:
> 
> v1->v2:
>     - New added patch ( sashiko's report )
> ---
>  drivers/cxl/core/region.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 52ba8e9e4288..ba77416055f4 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -2910,7 +2910,6 @@ static int cxl_get_poison_unmapped(struct cxl_memdev *cxlmd,
>  {
>  	struct cxl_dev_state *cxlds = cxlmd->cxlds;
>  	const struct resource *res;
> -	struct resource *p, *last;
>  	u64 offset, length;
>  	int rc = 0;
>  
> @@ -2923,10 +2922,8 @@ static int cxl_get_poison_unmapped(struct cxl_memdev *cxlmd,
>  	 */
>  	for (int i = ctx->part; i < cxlds->nr_partitions; i++) {
>  		res = &cxlds->part[i].res;
> -		for (p = res->child, last = NULL; p; p = p->sibling)
> -			last = p;
> -		if (last)
> -			offset = last->end + 1;
> +		if (i == ctx->part)
> +			offset = ctx->offset;
>  		else
>  			offset = res->start;
>  		length = res->end - offset + 1;