linux-kernel - Re: [RFC v1] tree-wide: remove "select FW

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Message-ID: <1432285597.27695.55.camel@x220>
Date:	Fri, 22 May 2015 11:06:37 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Borislav Petkov <bp@...en8.de>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.net>, clemens@...isch.de,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	JBottomley@...n.com, David Airlie <airlied@...ux.ie>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Marcel Holtmann <marcel@...tmann.org>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Imre Kaloz <kaloz@...nwrt.org>, khalasa@...p.pl,
	ohad@...ery.com, Arnd Bergmann <arnd@...db.de>, 3chas3@...il.com,
	Jiri Slaby <jslaby@...e.cz>, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v1] tree-wide: remove "select FW_LOADER" uses

On Fri, 2015-05-22 at 10:44 +0200, Takashi Iwai wrote:
> At Fri, 22 May 2015 10:17:48 +0200,
> Paul Bolle wrote:
> > Luis also tried to explain to me that disabling FW_LOADER shouldn't make
> > the build fail. (And, of course, we could decide to not care about
> > randconfig builds that have EXPERT set. Maybe we could even special case
> > EXPERT in randconfig. But that would make randconfig builds less useful.
> > That's a separate issue, anyhow.)
> 
> But FW_LOADER is a tristate, so it might be inconsistent if selected
> randomly?  Luis' patch doesn't add depends but just removes select.

include/linux/firmware.h contains:
    #if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE)
    int request_firmware(const struct firmware **fw, const char *name,
                         struct device *device);
    [...]
    #else
    static inline int request_firmware(const struct firmware **fw,
                                       const char *name,
                                       struct device *device)
    {
            return -EINVAL;
    }
    [...]
    #endif

So I _think_ the build should be fine.

But, in case of built-in users of request_firmware() and friends,
actually using that build might not go as expected. But if you set
EXPERT and disable FW_LOADER, or as you point out, set it to 'm', you
own the pieces when things break, don't you?

But now I'm doing Luis' job. I didn't sign off on that patch! So let's
hope Luis thought of all the corner cases.


Paul Bolle

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