The sync_cmos_clock function in kernel/time/ntp.c first tries to update
the internal clock of the cpu by calling the "update_persistent_clock64"
architecture specific function.  If this returns -ENODEV, it then tries
to update an external RTC using "rtc_set_ntp_time".

On the mips architecture, the weak implementation of the underlying
function would return 0 if it wasn't overridden.  This meant that the
sync_cmos_clock function would never try to update an external RTC
(if both CONFIG_GENERIC_CMOS_UPDATE and CONFIG_RTC_SYSTOHC are
configured)

Returning -ENODEV instead, means that an external RTC will be tried.

Signed-off-by: Luuk Paulussen <luuk.paulussen@alliedtelesis.co.nz>
Reviewed-by: Richard Laing <richard.laing@alliedtelesis.co.nz>
Reviewed-by: Scott Parlane <scott.parlane@alliedtelesis.co.nz>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14649/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

path: root/tools/perf/pmu-events/arch/x86/nehalemex/frontend.json

[
    {
        "EventCode": "0xD0",
        "Counter": "0,1,2,3",
        "UMask": "0x1",
        "EventName": "MACRO_INSTS.DECODED",
        "SampleAfterValue": "2000000",
        "BriefDescription": "Instructions decoded"
    },
    {
        "EventCode": "0xA6",
        "Counter": "0,1,2,3",
        "UMask": "0x1",
        "EventName": "MACRO_INSTS.FUSIONS_DECODED",
        "SampleAfterValue": "2000000",
        "BriefDescription": "Macro-fused instructions decoded"
    },
    {
        "EventCode": "0x19",
        "Counter": "0,1,2,3",
        "UMask": "0x1",
        "EventName": "TWO_UOP_INSTS_DECODED",
        "SampleAfterValue": "2000000",
        "BriefDescription": "Two Uop instructions decoded"
    }
]