On Wed, Feb 10, 2021 at 09:47:42AM -0400, Jason Gunthorpe wrote: > On Wed, Feb 10, 2021 at 09:11:49PM +1100, Stephen Rothwell wrote: > > Hi all, > > > > After merging the rdma tree, today's linux-next build (htmldocs) produced > > this warning: > > > > drivers/infiniband/core/device.c:859: warning: Function parameter or member 'dev' not described in 'ib_port_immutable_read' > > drivers/infiniband/core/device.c:859: warning: Function parameter or member 'port' not described in 'ib_port_immutable_read' > > > > Introduced by commit > > > > 7416790e2245 ("RDMA/core: Introduce and use API to read port immutable data") > > drivers/infinband is W=1 clean right now in linux-next > > But how can I build *only* drivers/infiniband using W=1 so I can keep > it that way? > > The rest of the kernel is not clean and creates too much warning noise > to be usable, even with my mini config. > > Just doing a 'make W=1 drivers/infiniband' is sort of OK, but then I > end up compiling things twice > > Does anyone know a good solution? > > Jason > Hi Jason, There was at one point an effort from Andrew Lunn to allow subsystems to opt in W=1 unconditionally but Masahiro had some concerns with both approaches: https://lore.kernel.org/r/20200919190258.3673246-1-andrew@xxxxxxx/ https://lore.kernel.org/r/20201001011232.4050282-1-andrew@xxxxxxx/ It looks like btrfs has just opted to copy the W=1 flags into its Makefile: https://git.kernel.org/next/linux-next/c/3a7b58d632b24ec3321f1ee3027bd407e09e515e Cheers, Nathan