linux-kernel - [PATCH] Fix PTP dependencies: explicitly select all the possible dependencies.

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Date:	Sun, 07 Oct 2012 22:14:29 +0800
From:	Haicheng Li <haicheng.li@...ux.intel.com>
To:	David Miller <davem@...emloft.net>
CC:	fengguang.wu@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix PTP dependencies: explicitly select all the possible
 dependencies.

Fengguang reported a kernel build failure as following:
drivers/built-in.o: In function `pch_gbe_ioctl':
pch_gbe_main.c:(.text+0x510370): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x510393): undefined reference to `pch_ch_control_write'
pch_gbe_main.c:(.text+0x5103b3): undefined reference to `pch_ch_control_write'
...

It's a regression by commit da1586461. The root cause is that
the CONFIG_PPS is not set there, consequently CONFIG_PTP_1588_CLOCK
can not be set anyway, which finally causes ptp_pch and pch_gbe_main
build failures.

As David prefers to use *select* to fix such module co-dependency issues,
this patch explicitly selects all the possible dependencies of PCH_PTP.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Reviewed-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Haicheng Li <haicheng.lee@...il.com>
---
  drivers/net/ethernet/oki-semi/pch_gbe/Kconfig |    3 +++
  1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/Kconfig 
b/drivers/net/ethernet/oki-semi/pch_gbe/Kconfig
index 9730241..5296cc8 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/Kconfig
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/Kconfig
@@ -26,6 +26,9 @@ if PCH_GBE
  config PCH_PTP
  	bool "PCH PTP clock support"
  	default n
+	depends on EXPERIMENTAL
+	select PPS
+	select PTP_1588_CLOCK
  	select PTP_1588_CLOCK_PCH
  	---help---
  	  Say Y here if you want to use Precision Time Protocol (PTP) in the
-- 
1.7.1
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