linux-kernel - Re: [PATCH] fs: export emergency

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Date:   Wed, 19 Jul 2023 06:21:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Bill O'Donnell <billodo@...hat.com>,
        Rob Barnes <robbarnes@...gle.com>, bleung@...omium.org,
        linux-fsdevel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: export emergency_sync

On 7/18/23 22:53, Christian Brauner wrote:
> On Tue, Jul 18, 2023 at 09:08:06PM -0700, Guenter Roeck wrote:
>> On Tue, Jul 18, 2023 at 05:13:06PM -0500, Bill O'Donnell wrote:
>>> On Tue, Jul 18, 2023 at 09:45:40PM +0000, Rob Barnes wrote:
>>>> emergency_sync forces a filesystem sync in emergency situations.
>>>> Export this function so it can be used by modules.
>>>>
>>>> Signed-off-by: Rob Barnes <robbarnes@...gle.com>
>>>
>>> Example of an emergency situation?
>>
>> An example from existing code in
>> drivers/firmware/arm_scmi/scmi_power_control.c:
>>
>> static inline void
>> scmi_request_forceful_transition(struct scmi_syspower_conf *sc)
>> {
>>          dev_dbg(sc->dev, "Serving forceful request:%d\n",
>>                  sc->required_transition);
>>
>> #ifndef MODULE
>>          emergency_sync();
>> #endif
>>
>> Arguably emergency_sync() should also be called if the file is built
>> as module.
>>
>> Either case, I think it would make sense to add an example to the commit
>> description.
> 
> On vacation until next. Please add a proper rationale why and who this
> export is needed by in the commit message. As right now it looks like
> someone thought it would be good to have which is not enough for
> something to become an export.


No, this is just wrong. Did you read Rob's response ? I just pointed out
that there is another user.

Guenter