netdev - Re: Lots of new warnings with gcc-7.1.1

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Date:   Wed, 12 Jul 2017 09:37:56 -0300
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tejun Heo <tj@...nel.org>, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sathya Prakash <sathya.prakash@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        IDE-ML <linux-ide@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alan Cox <alan@...yncelyn.cymru>
Subject: Re: Lots of new warnings with gcc-7.1.1

Em Tue, 11 Jul 2017 15:35:15 -0700
Linus Torvalds <torvalds@...ux-foundation.org> escreveu:

> [ Very random list of maintainers and mailing lists, at least
> partially by number of warnings generated by gcc-7.1.1 that is then
> correlated with the get_maintainers script ]

Under drivers/media, I fixed a bunch of gcc 7.1 warnings before the
merge window. While most were just noise, some actually pointed to
human errors.

Now, gcc-7.1.1 produces only 6 warnings with W=1 on x86_64 (allyesconfig), 
either due to unused-but-set-variable or unused-const-variable. I guess
both warning options are disabled by default. Anyway, I have patches
to fix them already. I'll send you later.

The atomisp staging driver is a completely different beast, with would
produce itself a huge amount of warnings. I ended by adding some
logic on drivers/staging/media/atomisp/ Makefiles to disable them:

	ccflags-y += $(call cc-disable-warning, missing-declarations)
	ccflags-y += $(call cc-disable-warning, missing-prototypes)
	ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
	ccflags-y += $(call cc-disable-warning, unused-const-variable)
	ccflags-y += $(call cc-disable-warning, suggest-attribute=format)
	ccflags-y += $(call cc-disable-warning, implicit-fallthrough)

(there's actually one patch pending related to atomisp, that I'll also
be sending you soon - meant to avoid warnings if compiled with an older
gcc version)

Thanks,
Mauro