Mathieu Desnoyers 902ccb86ed dax: fix incorrect list of data cache aliasing architectures ... commit d92576f116 ("dax: does not work correctly with virtual aliasing caches") prevents DAX from building on architectures with virtually aliased dcache with: depends on !(ARM || MIPS || SPARC) This check is too broad (e.g. recent ARMv7 don't have virtually aliased dcaches), and also misses many other architectures with virtually aliased data cache. This is a regression introduced in the v4.0 Linux kernel where the dax mount option is removed for 32-bit ARMv7 boards which have no data cache aliasing, and therefore should work fine with FS_DAX. This was turned into the following check in alloc_dax() by a preparatory change: if (ops && (IS_ENABLED(CONFIG_ARM) || IS_ENABLED(CONFIG_MIPS) || IS_ENABLED(CONFIG_SPARC))) return NULL; Use cpu_dcache_is_aliasing() instead to figure out whether the environment has aliasing data caches. Link: https://lkml.kernel.org/r/20240215144633.96437-10-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 15:27:20 -08:00
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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: fix incorrect list of data cache aliasing architectures	2024-02-22 15:27:20 -08:00