linux-kernel - [PATCH v3 3/3] cxl/region: Simplify cxl_region

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Date: Tue, 18 Jun 2024 16:46:39 +0800
From: Huang Ying <ying.huang@...el.com>
To: Dan Williams <dan.j.williams@...el.com>,
	Dave Jiang <dave.jiang@...el.com>
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Huang Ying <ying.huang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Bharata B Rao <bharata@....com>,
	Alistair Popple <apopple@...dia.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH v3 3/3] cxl/region: Simplify cxl_region_nid()

The node ID of the region can be gotten via resource start address
directly.  This simplifies the implementation of cxl_region_nid().

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Suggested-by: Alison Schofield <alison.schofield@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Bharata B Rao <bharata@....com>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
---
 drivers/cxl/core/region.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index dc15ceba7ab7..605efe3562c6 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2309,15 +2309,13 @@ static bool cxl_region_update_coordinates(struct cxl_region *cxlr, int nid)
 static int cxl_region_nid(struct cxl_region *cxlr)
 {
 	struct cxl_region_params *p = &cxlr->params;
-	struct cxl_endpoint_decoder *cxled;
-	struct cxl_decoder *cxld;
+	struct resource *res;
 
 	guard(rwsem_read)(&cxl_region_rwsem);
-	cxled = p->targets[0];
-	if (!cxled)
+        res = p->res;
+	if (!res)
 		return NUMA_NO_NODE;
-	cxld = &cxled->cxld;
-	return phys_to_target_node(cxld->hpa_range.start);
+	return phys_to_target_node(res->start);
 }
 
 static int cxl_region_perf_attrs_callback(struct notifier_block *nb,
-- 
2.39.2