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Subject[tip:x86/boot] x86/ACPI: Move ACPI_FADT_NO_CMOS_RTC check to ACPI boot code
Commit-ID:  088a8ef8207f19aadbade0971af21ad89fdc3815
Gitweb: http://git.kernel.org/tip/088a8ef8207f19aadbade0971af21ad89fdc3815
Author: Luis R. Rodriguez <mcgrof@kernel.org>
AuthorDate: Wed, 13 Apr 2016 17:04:35 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 22 Apr 2016 10:29:01 +0200

x86/ACPI: Move ACPI_FADT_NO_CMOS_RTC check to ACPI boot code

This moves the ACPI specific check into the ACPI boot code,
it also takes advantage of the x86_platform.legacy.rtc which
is checked for already on the RTC initialization code. This
lets us remove the nasty #ifdefery and consolidate the checks
to use only one toggle to disable the RTC init code.

The works as RTC is initialized by device_initcall(add_rtc_cmos),
this will run late in boot on start_kernel() during rest_init(),
acpi_parse_fadt() gets called earlier during setup_arch().

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: andrew.cooper3@citrix.com
Cc: andriy.shevchenko@linux.intel.com
Cc: bigeasy@linutronix.de
Cc: boris.ostrovsky@oracle.com
Cc: david.vrabel@citrix.com
Cc: ffainelli@freebox.fr
Cc: george.dunlap@citrix.com
Cc: glin@suse.com
Cc: jgross@suse.com
Cc: jlee@suse.com
Cc: josh@joshtriplett.org
Cc: julien.grall@linaro.org
Cc: konrad.wilk@oracle.com
Cc: kozerkov@parallels.com
Cc: lenb@kernel.org
Cc: lguest@lists.ozlabs.org
Cc: linux-acpi@vger.kernel.org
Cc: lv.zheng@intel.com
Cc: matt@codeblueprint.co.uk
Cc: mbizon@freebox.fr
Cc: rjw@rjwysocki.net
Cc: robert.moore@intel.com
Cc: rusty@rustcorp.com.au
Cc: tiwai@suse.de
Cc: toshi.kani@hp.com
Cc: xen-devel@lists.xensource.com
Link: http://lkml.kernel.org/r/1460592286-300-6-git-send-email-mcgrof@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/acpi/boot.c | 4 ++++
arch/x86/kernel/rtc.c | 8 --------
2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 8c2f1ef..8c9c2bd 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -913,6 +913,10 @@ late_initcall(hpet_insert_resource);

static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
+ if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
+ pr_debug("ACPI: not registering RTC platform device\n");
+ x86_platform.legacy.rtc = 0;
+ }

#ifdef CONFIG_X86_PM_TIMER
/* detect the location of the ACPI PM Timer */
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 62c48da..ff4f418 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -189,14 +189,6 @@ static __init int add_rtc_cmos(void)
if (of_have_populated_dt())
return 0;

-#ifdef CONFIG_ACPI
- if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
- /* This warning can likely go away again in a year or two. */
- pr_info("ACPI: not registering RTC platform device\n");
- return -ENODEV;
- }
-#endif
-
if (!x86_platform.legacy.rtc)
return -ENODEV;

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