[Bugme-janitors] [Bug 23822] New: Hardware clock (/dev/rtc) not working on RHEL5 and CentOS-5

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=23822

               URL: http://elrepo.org/bugs/view.php?id=92
           Summary: Hardware clock (/dev/rtc) not working on RHEL5 and
                    CentOS-5
           Product: Timers
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Realtime Clock
        AssignedTo: timers_realtime-clock at kernel-bugs.osdl.org
        ReportedBy: dag at wieers.com
        Regression: Yes


On RHEL5 and CentOS-5 with a recent kernel, depending upon the hardware being
used, the RTC may not be accessible. This can be checked by executing
/sbin/hwclock --debug.

This is a regression in more recent kernels than 2.6.18 (kernel change has not
been identified yet, goes back to at least 2007).

During boot /dev/rtc is missing, and since this is needed by hwclock before
starting udev, there is no proper way to fix it unless we modify the
infrastructure from the vendor (/etc/rc.sysinit).

The fix could be as easy as to symlink to /dev/rtc0 or creating the /dev/rtc
device node with the newer major/minor, which is tested and works. A new CONFIG
option providing this backward compatibility would be welcome.

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