linux-kernel - Re: [PATCH 4.19 18/56] hv: utils: add PTP_1588

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Date:   Mon, 20 Dec 2021 21:31:36 +0100
From:   Pavel Machek <pavel@....cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        linux-hyperv@...r.kernel.org,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 18/56] hv: utils: add PTP_1588_CLOCK to Kconfig to
 fix build

Hi!

> From: Randy Dunlap <rdunlap@...radead.org>
> 
> [ Upstream commit 1dc2f2b81a6a9895da59f3915760f6c0c3074492 ]
> 
> 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'

This is bad idea for 4.19:

> +++ b/drivers/hv/Kconfig
> @@ -16,6 +16,7 @@ config HYPERV_TSCPAGE
>  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.

grep -ri PTP_1588_CLOCK_OPTIONAL .

Results in no result in 4.19. So this will break hyperv. No results in
5.10, either, so it is bad idea there, too.

								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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