RE: [PATCH] hv: utils: add PTP_1588_CLOCK to Kconfig to fix build

[Michael Kelley (LINUX)]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Sent: Thursday, November 25, 2021 6:33 PM
> 
> The hyperv utilities use PTP clock interfaces and should depend a
> a kconfig symbol such that they will be built as a loadable module or
> builtin so that linker errors do not happen.
> 
> Prevents these build errors:
> 
> ld: drivers/hv/hv_util.o: in function `hv_timesync_deinit':
> hv_util.c:(.text+0x37d): undefined reference to `ptp_clock_unregister'
> ld: drivers/hv/hv_util.o: in function `hv_timesync_init':
> hv_util.c:(.text+0x738): undefined reference to `ptp_clock_register'
> 
> Fixes: 46a971913611a ("Staging: hv: move hyperv code out of staging directory")

Seems like the "Fixes" tag should reference something a little newer than
when the Hyper-V code was first added.  Either commit 3716a49a81ba
("hv_utils: implement Hyper-V PTP source") or commit e5f31552674e 
("ethernet: fix PTP_1588_CLOCK dependencies") when
PTP_1588_CLOCK_OPTIONAL was added.

> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu@xxxxxxxxxx>
> Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
> Cc: linux-hyperv@xxxxxxxxxxxxxxx
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/hv/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> --- linux-next-20211125.orig/drivers/hv/Kconfig
> +++ linux-next-20211125/drivers/hv/Kconfig
> @@ -19,6 +19,7 @@ config HYPERV_TIMER
>  config HYPERV_UTILS
>  	tristate "Microsoft Hyper-V Utilities driver"
>  	depends on HYPERV && CONNECTOR && NLS
> +	depends on PTP_1588_CLOCK_OPTIONAL
>  	help
>  	  Select this option to enable the Hyper-V Utilities.
> 

Modulo the "Fixes" tag comment,

Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>