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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Mathieu Desnoyers wrote: > commit d92576f1167c ("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. > > Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches") > Signed-off-by: Mathieu Desnoyers > Cc: Andrew Morton > Cc: Linus Torvalds > Cc: Dan Williams > Cc: Vishal Verma > Cc: Dave Jiang > Cc: Matthew Wilcox > Cc: Arnd Bergmann > Cc: Russell King > Cc: linux-arch@vger.kernel.org > Cc: linux-cxl@vger.kernel.org > Cc: linux-fsdevel@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-xfs@vger.kernel.org > Cc: dm-devel@lists.linux.dev > Cc: nvdimm@lists.linux.dev > --- > drivers/dax/super.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c > index ce5bffa86bba..a21a7c262382 100644 > --- a/drivers/dax/super.c > +++ b/drivers/dax/super.c > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include > #include "dax-private.h" > > /** > @@ -455,9 +456,7 @@ struct dax_device *alloc_dax(void *private, const struct dax_operations *ops) > * except for device-dax (NULL operations pointer), which does > * not use aliased mappings from the kernel. > */ > - if (ops && (IS_ENABLED(CONFIG_ARM) || > - IS_ENABLED(CONFIG_MIPS) || > - IS_ENABLED(CONFIG_SPARC))) > + if (ops && cpu_dcache_is_aliasing()) > return ERR_PTR(-EOPNOTSUPP); Looks good, Reviewed-by: Dan Williams