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1df4ca0155
linux/drivers/dax
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Mathieu Desnoyers 1df4ca0155 dax: check for data cache aliasing at runtime 
Replace the following fs/Kconfig:FS_DAX dependency:

  depends on !(ARM || MIPS || SPARC)

By a runtime check within alloc_dax(). This runtime check returns
ERR_PTR(-EOPNOTSUPP) if the @ops parameter is non-NULL (which means
the kernel is using an aliased mapping) on an architecture which
has data cache aliasing.

Change the return value from NULL to PTR_ERR(-EOPNOTSUPP) for
CONFIG_DAX=n for consistency.

This is done in preparation for using cpu_dcache_is_aliasing() in a
following change which will properly support architectures which detect
data cache aliasing at runtime.

Link: https://lkml.kernel.org/r/20240215144633.96437-8-mathieu.desnoyers@efficios.com
Fixes: d92576f116 ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Michael Sclafani <dm-devel@lists.linux.dev>
Cc: Mike Snitzer <snitzer@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-02-22 15:27:19 -08:00
..
hmem dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
pmem dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
bus.c dax: add a sysfs knob to control memmap_on_memory behavior 2024-02-22 10:24:40 -08:00
bus.h dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
cxl.c dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
dax-private.h dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
device.c mm: remove enum page_entry_size 2023-08-24 16:20:30 -07:00
Kconfig cxl for v6.3 2023-02-25 09:19:23 -08:00
kmem.c dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
Makefile cxl/dax: Create dax devices for CXL RAM regions 2023-02-10 17:33:45 -08:00
pmem.c dax/kmem: allow kmem to add memory with memmap_on_memory 2023-12-10 16:51:35 -08:00
super.c dax: check for data cache aliasing at runtime 2024-02-22 15:27:19 -08:00