linux-kernel - Re: [PATCH 2/9] fix empty-body warning in posix

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Message-Id: <F8B969BE-A2B1-4E6D-8746-BBFBE6399328@zzywysm.com>
Date:   Mon, 20 Apr 2020 14:58:31 -0500
From:   Zzy Wysm <zzy@...wysm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        Johannes Berg <johannes@...solutions.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        target-devel <target-devel@...r.kernel.org>
Subject: Re: [PATCH 2/9] fix empty-body warning in posix_acl.c


> On Apr 18, 2020, at 1:53 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> Thirdly, there's a *reason* why "-Wextra" isn't used.
> 
> The warnings enabled by -Wextra are usually complete garbage, and
> trying to fix them often makes the code worse. Exactly like here.
> 

As the instigator of this warning cleanup activity, even _I_ don’t recommend
building with all of -Wextra.  Doing so on an allmodconfig build generates 
500 megabytes of warning text (not exaggerating), primarily due to 
-Wunused-parameter and Wmissing-field-initializers.

I strongly recommend disabling them with -Wno-unused-parameter 
-Wno-missing-field-initializers since the spew is completely unactionable.

On the other hand, -Woverride-init found a legit bug that was breaking DVD
drives, fixed in commit 03264ddde2453f6877a7d637d84068079632a3c5.

I believe finding a good set of compiler warning settings can lead to lots of 
good bugs being spotted and (hopefully) fixed.  Why let syzbot do all the work?

zzy