Dave Jiang 0134ed4fb9 device-dax: fix pmd/pte fault fallback handling ... Jeff Moyer reports: With a device dax alignment of 4KB or 2MB, I get sigbus when running the attached fio job file for the current kernel (4.11.0-rc1+). If I specify an alignment of 1GB, it works. I turned on debug output, and saw that it was failing in the huge fault code. dax dax1.0: dax_open dax dax1.0: dax_mmap dax dax1.0: dax_dev_huge_fault: fio: write (0x7f08f0a00000 - dax dax1.0: __dax_dev_pud_fault: phys_to_pgoff(0xffffffffcf60 dax dax1.0: dax_release fio config for reproduce: [global] ioengine=dev-dax direct=0 filename=/dev/dax0.0 bs=2m [write] rw=write [read] stonewall rw=read The driver fails to fallback when taking a fault that is larger than the device alignment, or handling a larger fault when a smaller mapping is already established. While we could support larger mappings for a device with a smaller alignment, that change is too large for the immediate fix. The simplest change is to force fallback until the fault size matches the alignment. Fixes: dee4107924 ("/dev/dax, core: file operations and dax-mmap") Cc: <stable@vger.kernel.org> Reported-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2017-03-10 18:15:04 -08:00
..
dax.c	device-dax: fix pmd/pte fault fallback handling	2017-03-10 18:15:04 -08:00
dax.h	dax: convert devm_create_dax_dev to PTR_ERR	2016-10-07 16:45:59 -07:00
Kconfig	nvdimm: make CONFIG_NVDIMM_DAX 'bool'	2016-10-27 16:16:21 -07:00
Makefile
pmem.c	Merge branch 'for-4.10/libnvdimm' into libnvdimm-for-next	2016-12-17 15:08:10 -08:00