linux-kernel - Re: [01/10] watchdog/hpwdt: Remove legacy NMI sourcing.

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Message-ID: <20180211175625.GA22035@roeck-us.net>
Date:   Sun, 11 Feb 2018 09:56:25 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jerry Hoemann <jerry.hoemann@....com>
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org, rwright@....com,
        maurice.a.saldivar@....com
Subject: Re: [01/10] watchdog/hpwdt: Remove legacy NMI sourcing.

On Tue, Feb 06, 2018 at 03:58:46PM -0700, Jerry Hoemann wrote:
> Gen8 and prior Proliant systems supported the "CRU" interface
> to firmware.  This interfaces allows linux to "call back" into firmware
> to source the cause of an NMI.  This feature isn't fully utilized
> as the actual source of the NMI isn't printed, the driver only
> indicates that the source couldn't be determined when the call
> fails.
> 
> With the advent of Gen9, iCRU replaces the CRU. The call back
> feature is no longer available in firmware.  To be compatible and
> not attempt to call back into firmware on system not supporting CRU,
> the SMBIOS table is consulted to determine if it is safe to
> make the call back or not.
> 
> This results in about half of the driver code being devoted
> to either making CRU calls or determing if it is safe to make
> CRU calls.  As noted, the driver isn't really using the results of
> the CRU calls.
> 
> As the CRU sourcing of the NMI isn't required for handling the
> NMI, remove the legacy (pre Gen9) NMI sourcing and the DMI code to
> determine if the system had the CRU interface.
> 
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Spoke too early. This fails to compile if CONFIG_HPWDT_NMI_DECODING
is disabled. Please fix and resubmit the series, and please make sure
that each patch compiles on its own.

Thanks,
Guenter