From: Johannes Berg <johannes@sipsolutions.net>
To: Takashi Iwai <tiwai@suse.de>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: systemd-rfkill regression on 5.11 and later kernels
Date: Fri, 19 Mar 2021 23:15:14 +0100 [thread overview]
Message-ID: <14f7bbfea8a17dcd12e7d40641198063428d19b3.camel@sipsolutions.net> (raw)
In-Reply-To: <9db9d9ae751a50c9fd1da1ee3bd4c564546ce1c5.camel@sipsolutions.net> (sfid-20210318_121746_242488_98446BA5)
On Thu, 2021-03-18 at 12:16 +0100, Johannes Berg wrote:
> > Yeah, that's a dilemma. An oft-seen trick is to add more bytes for
> > the future use, e.g. extend to 16 bytes and fill 0 for the remaining.
>
> Yeah, I guess I could stick a reserved[15] there, it's small enough.
Actually, that doesn't really help anything either.
If today I require that the reserved bytes are sent as 0 by userspace,
then any potential expansion that requires userspace to set it will
break when userspace does it and runs on an old kernel.
If I don't require the reserved bytes to be set to 0 then somebody will
invariably get it wrong and send garbage, and then we again cannot
extend it.
So ... that all seems pointless. I guess I'll send the patch as it is
now.
johannes
prev parent reply other threads:[~2021-03-19 22:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 8:27 systemd-rfkill regression on 5.11 and later kernels Takashi Iwai
2021-03-18 9:26 ` Emmanuel Grumbach
2021-03-18 9:36 ` Johannes Berg
2021-03-18 10:07 ` Takashi Iwai
2021-03-18 10:50 ` Johannes Berg
2021-03-18 11:11 ` Takashi Iwai
2021-03-18 11:16 ` Johannes Berg
2021-03-19 22:15 ` Johannes Berg [this message]
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