libnvdimm: Remove unused nd_region_conflict

JIRA: https://issues.redhat.com/browse/RHEL-96846

commit 878a8e1
Author: Dr. David Alan Gilbert <linux@treblig.org>
Date:   Thu Feb 20 00:45:37 2025 +0000

    libnvdimm: Remove unused nd_region_conflict
    
    nd_region_conflict() has been unused since 2019's
    commit a361919 ("libnvdimm/pfn: stop padding pmem namespaces to
    section alignment")
    
    Remove it, and the region_confict() helper it uses, and the associated
    struct conflict_context.
    
    Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
    Reviewed-by: Ira Weiny <ira.weiny@intel.com>
    Link: https://patch.msgid.link/20250220004538.84585-2-linux@treblig.org
    Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>

Author: JeffMoyer

drivers/nvdimm/nd-core.h

@@ -127,8 +127,6 @@ resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
 				      struct nd_mapping *nd_mapping);
 resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
-int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
-		resource_size_t size);
 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
 		struct nd_label_id *label_id);
 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);

drivers/nvdimm/region_devs.c

@@ -1229,45 +1229,4 @@ bool is_nvdimm_sync(struct nd_region *nd_region)
 }
 EXPORT_SYMBOL_GPL(is_nvdimm_sync);
 
-struct conflict_context {
-	struct nd_region *nd_region;
-	resource_size_t start, size;
-};
-
-static int region_conflict(struct device *dev, void *data)
-{
-	struct nd_region *nd_region;
-	struct conflict_context *ctx = data;
-	resource_size_t res_end, region_end, region_start;
-
-	if (!is_memory(dev))
-		return 0;
-
-	nd_region = to_nd_region(dev);
-	if (nd_region == ctx->nd_region)
-		return 0;
-
-	res_end = ctx->start + ctx->size;
-	region_start = nd_region->ndr_start;
-	region_end = region_start + nd_region->ndr_size;
-	if (ctx->start >= region_start && ctx->start < region_end)
-		return -EBUSY;
-	if (res_end > region_start && res_end <= region_end)
-		return -EBUSY;
-	return 0;
-}
-
-int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
-		resource_size_t size)
-{
-	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
-	struct conflict_context ctx = {
-		.nd_region = nd_region,
-		.start = start,
-		.size = size,
-	};
-
-	return device_for_each_child(&nvdimm_bus->dev, &ctx, region_conflict);
-}
-
 MODULE_IMPORT_NS("DEVMEM");