On Tue, Jan 30, 2024 at 11:52:54AM -0500, Mathieu Desnoyers wrote: > Introduce a generic way to query whether the dcache is virtually aliased > on all architectures. Its purpose is to ensure that subsystems which > are incompatible with virtually aliased data caches (e.g. FS_DAX) can > reliably query this. > > For dcache aliasing, there are three scenarios dependending on the > architecture. Here is a breakdown based on my understanding: > > A) The dcache is always aliasing: > > * arc > * csky > * m68k (note: shared memory mappings are incoherent ? SHMLBA is missing there.) > * sh > * parisc /me wonders why the dentry cache aliasing has problems on these systems. Oh, dcache != fs/dcache.c (the VFS dentry cache). Can you please rename this function appropriately so us dumb filesystem people don't confuse cpu data cache configurations with the VFS dentry cache aliasing when we read this code? Something like cpu_dcache_is_aliased(), perhaps? -Dave. -- Dave Chinner david@xxxxxxxxxxxxx
