linux-kernel - Re: [PATCH v3 01/11] watchdog/hpwdt: Remove legacy NMI sourcing.

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Date:   Fri, 16 Feb 2018 08:22:46 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Jerry Hoemann <jerry.hoemann@....com>
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        rwright@....com, maurice.a.saldivar@....com,
        marcus.folkesson@...il.com
Subject: Re: [PATCH v3 01/11] watchdog/hpwdt: Remove legacy NMI sourcing.


* Jerry Hoemann <jerry.hoemann@....com> 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>
> ---
>  drivers/watchdog/hpwdt.c | 490 +----------------------------------------------
>  1 file changed, 8 insertions(+), 482 deletions(-)

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo