> -----Original Message----- > From: Linux-nvdimm [mailto:linux-nvdimm-bounces@xxxxxxxxxxxx] On Behalf Of > Dave Jiang > Sent: Thursday, June 14, 2018 1:25 PM > Subject: [PATCH] mm: disallow mapping that conflict for > devm_memremap_pages() ... > + conflict_pgmap = get_dev_pagemap(PHYS_PFN(align_start), NULL); > + if (conflict_pgmap) { > + dev_warn(dev, "Conflicting mapping in same section\n"); > + put_dev_pagemap(conflict_pgmap); > + return ERR_PTR(-ENOMEM); > + } > + > + conflict_pgmap = get_dev_pagemap(PHYS_PFN(align_end), NULL); > + if (conflict_pgmap) { > + dev_warn(dev, "Conflicting mapping in same section\n"); > + put_dev_pagemap(conflict_pgmap); > + return ERR_PTR(-ENOMEM); > + } Unique warning messages would help narrow down the problem. dev_WARN is one way to make them unique, if a backtrace is also appropriate. --- Robert Elliott, HPE Persistent Memory
