Tomas Glozar 36c75ce3bd nd_btt: Make BTT lanes preemptible ... nd_region_acquire_lane uses get_cpu, which disables preemption. This is an issue on PREEMPT_RT kernels, since btt_write_pg and also nd_region_acquire_lane itself take a spin lock, resulting in BUG: sleeping function called from invalid context. Fix the issue by replacing get_cpu with smp_process_id and migrate_disable when needed. This makes BTT operations preemptible, thus permitting the use of spin_lock. BUG example occurring when running ndctl tests on PREEMPT_RT kernel: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4903, name: libndctl preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 Preemption disabled at: [<ffffffffc1313db5>] nd_region_acquire_lane+0x15/0x90 [libnvdimm] Call Trace: <TASK> dump_stack_lvl+0x8e/0xb0 __might_resched+0x19b/0x250 rt_spin_lock+0x4c/0x100 ? btt_write_pg+0x2d7/0x500 [nd_btt] btt_write_pg+0x2d7/0x500 [nd_btt] ? local_clock_noinstr+0x9/0xc0 btt_submit_bio+0x16d/0x270 [nd_btt] __submit_bio+0x48/0x80 __submit_bio_noacct+0x7e/0x1e0 submit_bio_wait+0x58/0xb0 __blkdev_direct_IO_simple+0x107/0x240 ? inode_set_ctime_current+0x51/0x110 ? __pfx_submit_bio_wait_endio+0x10/0x10 blkdev_write_iter+0x1d8/0x290 vfs_write+0x237/0x330 ... </TASK> Fixes: 5212e11fde ("nd_btt: atomic sector updates") Signed-off-by: Tomas Glozar <tglozar@redhat.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com>		2023-09-27 10:33:47 -07:00
..
badrange.c	mm/memremap_pages: convert to 'struct range'	2020-10-13 18:38:28 -07:00
btt_devs.c	nvdimm: Drop nd_device_lock()	2022-04-28 14:01:55 -07:00
btt.c	block: remove ->rw_page	2023-02-02 22:33:34 -08:00
btt.h	nvdimm-btt: convert to blk_alloc_disk/blk_cleanup_disk	2021-06-01 07:42:23 -06:00
bus.c	nvdimm: make nd_class variable static	2023-06-23 14:55:58 -06:00
claim.c	libnvdimm: Cleanup include of badblocks.h	2020-12-15 21:47:45 -08:00
core.c	nvdimm: Fix firmware activation deadlock scenarios	2022-04-28 14:01:56 -07:00
dax_devs.c	driver core: make struct bus_type.uevent() take a const *	2023-01-27 13:45:52 +01:00
dimm_devs.c	nvdimm: make security_show static	2023-06-23 15:08:24 -06:00
dimm.c	libnvdimm: Make remove callback return void	2021-02-16 19:35:29 -08:00
e820.c
Kconfig	nvdimm: Support sizeof(struct page) > MAX_STRUCT_PAGE_SIZE	2023-01-28 15:32:36 -08:00
label.c	nvdimm/region: Delete nd_blk_region infrastructure	2022-03-11 15:53:13 -08:00
label.h	nvdimm/region: Delete nd_blk_region infrastructure	2022-03-11 15:53:13 -08:00
Makefile	drivers/nvdimm: Fix build failure when CONFIG_PERF_EVENTS is not set	2022-03-23 12:17:36 -07:00
namespace_devs.c	nvdimm: Use kstrtobool() instead of strtobool()	2023-07-19 08:42:50 -07:00
nd_perf.c	nvdimm: Fix dereference after free in register_nvdimm_pmu()	2023-08-17 09:34:03 -07:00
nd_virtio.c	virtio_pmem: add the missing REQ_OP_WRITE for flush bio	2023-07-19 08:44:36 -07:00
nd-core.h	cxl for v6.3	2023-02-25 09:19:23 -08:00
nd.h	Driver core changes for 6.3-rc1	2023-02-24 12:58:55 -08:00
of_pmem.c	libnvdimm/of_pmem: Use devm_kstrdup instead of kstrdup and check its return value	2023-09-27 10:33:47 -07:00
pfn_devs.c	nvdimm changes for v6.6 merge window	2023-08-30 20:52:08 -07:00
pfn.h	libnvdimm/namespace: Enforce memremap_compat_align()	2020-03-17 12:23:21 -07:00
pmem.c	nvdimm: Use kstrtobool() instead of strtobool()	2023-07-19 08:42:50 -07:00
pmem.h	dax: introduce DAX_RECOVERY_WRITE dax access mode	2022-05-16 13:35:56 -07:00
region_devs.c	nd_btt: Make BTT lanes preemptible	2023-09-27 10:33:47 -07:00
region.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: populate numa information	2023-02-15 06:46:22 -05:00
virtio_pmem.h