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x86: add warning when RTC clock reports binary

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We assume that the RTC clock is BCD, so print a warning if it claims
to be binary.

[ tglx@linutronix.de: changed to WARN_ON - we want to know that!
  If no one reports it we can remove the complete if (RTC_ALWAYS_BCD)
  magic, which has RTC_ALWAYS_BCD defined to 1 since Linux 1.0 ... ]

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andi Kleen 2008-02-09 16:16:59 +01:00 committed by Ingo Molnar
parent b62576a2f5
commit 068c9222d0
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kernel/rtc.c
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@ -94,7 +94,7 @@ int mach_set_rtc_mmss(unsigned long nowtime)
unsigned long mach_get_cmos_time(void)
{
unsigned int year, mon, day, hour, min, sec, century = 0;
unsigned int status, year, mon, day, hour, min, sec, century = 0;
/*
* If UIP is clear, then we have >= 244 microseconds before
@ -119,7 +119,10 @@ unsigned long mach_get_cmos_time(void)
century = CMOS_READ(acpi_gbl_FADT.century);
#endif
if (RTC_ALWAYS_BCD || !(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)) {
status = CMOS_READ(RTC_CONTROL);
WARN_ON_ONCE((RTC_ALWAYS_BCD && (status & RTC_DM_BINARY));
if (RTC_ALWAYS_BCD || !(status & RTC_DM_BINARY)) {
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hour);