linux-kernel - Re: 2.6.25-rc7: Ugh.

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Date:	Fri, 28 Mar 2008 02:49:41 -0700
From:	David Brownell <david-b@...bell.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mark Lord <lkml@....ca>, David Miller <davem@...emloft.net>,
	jkosina@...e.cz, gregkh@...e.de, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, pavel@...e.cz,
	akpm@...ux-foundation.org, rtc-linux@...glegroups.com
Subject: Re: 2.6.25-rc7: Ugh.

On Friday 28 March 2008, Ingo Molnar wrote:
> > > Could somebody please fix the RTC mess in kconfig now ?
> > 
> > My version has been sitting in MM for a while now.
> 
> could you please provide an URL or the patch itself so that others who 
> hit this issue and read this thread can apply the fix?

I merged the two patches (gentle, then harsh) so the result is
smaller.  Here you go.

- dave


========== CUT HERE
Prevent the most significant RTC configuration problems:

 - If the new RTC framework is enabled, don't allow any of the
   legacy drivers to be configured.

 - When using generic RTC on x86, enable rtc-cmos by default.

It seems too many people are used to enabling a legacy RTC despite 
the Kconfig help/comments; the gentle approach hasn't worked.

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
 drivers/char/Kconfig |    8 ++++++++
 drivers/rtc/Kconfig  |    5 +----
 2 files changed, 9 insertions(+), 4 deletions(-)

--- linux-2.6.orig/drivers/char/Kconfig	2008-03-28 02:35:58.000000000 -0700
+++ linux-2.6/drivers/char/Kconfig	2008-03-28 02:39:17.000000000 -0700
@@ -704,6 +704,12 @@ config NVRAM
 	  To compile this driver as a module, choose M here: the
 	  module will be called nvram.
 
+#
+# These legacy RTC drivers just cause too many conflicts with the generic
+# RTC framework ... let's not even try to coexist any more.
+#
+if RTC_LIB=n
+
 config RTC
 	tristate "Enhanced Real Time Clock Support"
 	depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV && !ARM && !SUPERH && !S390
@@ -812,6 +818,8 @@ config DS1302
 	  will get access to the real time clock (or hardware clock) built
 	  into your computer.
 
+endif # RTC_LIB
+
 config COBALT_LCD
 	bool "Support for Cobalt LCD"
 	depends on MIPS_COBALT
--- linux-2.6.orig/drivers/rtc/Kconfig	2008-03-28 02:35:58.000000000 -0700
+++ linux-2.6/drivers/rtc/Kconfig	2008-03-28 02:39:12.000000000 -0700
@@ -20,10 +20,6 @@ menuconfig RTC_CLASS
 
 if RTC_CLASS
 
-if GEN_RTC || RTC
-comment "Conflicting RTC option has been selected, check GEN_RTC and RTC"
-endif
-
 config RTC_HCTOSYS
 	bool "Set system time from RTC on startup and resume"
 	depends on RTC_CLASS = y
@@ -303,6 +299,7 @@ comment "Platform RTC drivers"
 config RTC_DRV_CMOS
 	tristate "PC-style 'CMOS'"
 	depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
+	default y if X86
 	help
 	  Say "yes" here to get direct support for the real time clock
 	  found in every PC or ACPI-based system, and some other boards.
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