Dan Williams c91d713630 nvdimm: Support sizeof(struct page) > MAX_STRUCT_PAGE_SIZE ... Commit 6e9f05dc66 ("libnvdimm/pfn_dev: increase MAX_STRUCT_PAGE_SIZE") ...updated MAX_STRUCT_PAGE_SIZE to account for sizeof(struct page) potentially doubling in the case of CONFIG_KMSAN=y. Unfortunately this doubles the amount of capacity stolen from user addressable capacity for everyone, regardless of whether they are using the debug option. Revert that change, mandate that MAX_STRUCT_PAGE_SIZE never exceed 64, but allow for debug scenarios to proceed with creating debug sized page maps with a compile option to support debug scenarios. Note that this only applies to cases where the page map is permanent, i.e. stored in a reservation of the pmem itself ("--map=dev" in "ndctl create-namespace" terms). For the "--map=mem" case, since the allocation is ephemeral for the lifespan of the namespace, there are no explicit restriction. However, the implicit restriction, of having enough available "System RAM" to store the page map for the typically large pmem, still applies. Fixes: 6e9f05dc66 ("libnvdimm/pfn_dev: increase MAX_STRUCT_PAGE_SIZE") Cc: <stable@vger.kernel.org> Cc: Alexander Potapenko <glider@google.com> Cc: Marco Elver <elver@google.com> Reported-by: Jeff Moyer <jmoyer@redhat.com> Acked-by: Yu Zhao <yuzhao@google.com> Link: https://lore.kernel.org/r/167467815773.463042.7022545814443036382.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2023-01-28 15:32:36 -08:00
..
badrange.c
btt.c
btt.h
btt_devs.c
bus.c
claim.c
core.c
dax_devs.c
dimm.c
dimm_devs.c	libnvdimm: Introduce CONFIG_NVDIMM_SECURITY_TEST flag	2022-12-01 12:42:35 -08:00
e820.c
Kconfig	nvdimm: Support sizeof(struct page) > MAX_STRUCT_PAGE_SIZE	2023-01-28 15:32:36 -08:00
label.c
label.h
Makefile
namespace_devs.c	libnvdimm for 6.1	2022-10-14 18:41:41 -07:00
nd-core.h
nd.h	nvdimm: Support sizeof(struct page) > MAX_STRUCT_PAGE_SIZE	2023-01-28 15:32:36 -08:00
nd_perf.c
nd_virtio.c
of_pmem.c
pfn.h
pfn_devs.c	nvdimm: Support sizeof(struct page) > MAX_STRUCT_PAGE_SIZE	2023-01-28 15:32:36 -08:00
pmem.c
pmem.h
region.c	nvdimm/region: Move cache management to the region driver	2022-12-02 23:52:32 -08:00
region_devs.c	nvdimm/region: Move cache management to the region driver	2022-12-02 23:52:32 -08:00
security.c	nvdimm/region: Move cache management to the region driver	2022-12-02 23:52:32 -08:00
virtio_pmem.c
virtio_pmem.h