Le 12/09/2022 à 15:46, Lukas Bulwahn a écrit : > Hi Joe, hi Ben, > > While reviewing some kernel config, I came across > CONFIG_DCACHE_WORD_ACCESS and tried to understand its purpose. > > Then, I discovered this RFC patch from 2014 that seems never to have > been integrated: > > https://lore.kernel.org/all/1393964591.20435.58.camel@joe-AO722/ > [RFC] Remove CONFIG_DCACHE_WORD_ACCESS > > The discussion seemed to just not continue and the patch was just not > integrated by anyone. > > In the meantime, the use of CONFIG_DCACHE_WORD_ACCESS has spread into > a few more files, but replacing it with > CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS still seems feasible. > > Are you aware of reasons that this patch from 2014 should not be integrated? > > I would spend some time to move the integration of this patch further > if you consider that the patch is not completely wrong. > As far as I can see, for the time being this is not equivalent on powerpc: select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU) select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN This will need to be investigated I guess. In the meantime I'll try to see if it makes any difference for ppc32. Christophe
