Re: [PATCH v2 10/10] RFC: usb-storage: export symbols in USB_STORAGE namespace

[Greg KH]

On Tue, Aug 13, 2019 at 01:17:07PM +0100, Matthias Maennich wrote:
> Modules using these symbols are required to explicitly import the
> namespace. This patch was generated with the following steps and serves
> as a reference to use the symbol namespace feature:
> 
>  1) Define DDEFAULT_SYMBOL_NAMESPACE in the corresponding Makefile
>  2) make  (see warnings during modpost about missing imports)
>  3) make nsdeps
> 
> Instead of a DEFAULT_SYMBOL_NAMESPACE definition, the EXPORT_SYMBOL_NS
> variants can be used to explicitly specify the namespace. The advantage
> of the method used here is that newly added symbols are automatically
> exported and existing ones are exported without touching their
> respective EXPORT_SYMBOL macro expansion.
> 
> Signed-off-by: Matthias Maennich <maennich@xxxxxxxxxx>
> ---
>  drivers/usb/storage/Makefile        | 2 ++
>  drivers/usb/storage/alauda.c        | 1 +
>  drivers/usb/storage/cypress_atacb.c | 1 +
>  drivers/usb/storage/datafab.c       | 1 +
>  drivers/usb/storage/ene_ub6250.c    | 1 +
>  drivers/usb/storage/freecom.c       | 1 +
>  drivers/usb/storage/isd200.c        | 1 +
>  drivers/usb/storage/jumpshot.c      | 1 +
>  drivers/usb/storage/karma.c         | 1 +
>  drivers/usb/storage/onetouch.c      | 1 +
>  drivers/usb/storage/realtek_cr.c    | 1 +
>  drivers/usb/storage/sddr09.c        | 1 +
>  drivers/usb/storage/sddr55.c        | 1 +
>  drivers/usb/storage/shuttle_usbat.c | 1 +
>  drivers/usb/storage/uas.c           | 1 +
>  15 files changed, 16 insertions(+)
> 
> diff --git a/drivers/usb/storage/Makefile b/drivers/usb/storage/Makefile
> index a67ddcbb4e24..46635fa4a340 100644
> --- a/drivers/usb/storage/Makefile
> +++ b/drivers/usb/storage/Makefile
> @@ -8,6 +8,8 @@
>  
>  ccflags-y := -I $(srctree)/drivers/scsi
>  
> +ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=USB_STORAGE

Wait, we have to do this for every subsystem?  I thought there was a
macro we could use in the code itself for this.  What changed from
earlier versions, or was this always here?

thanks,

greg k-h