From: Randy Dunlap <rdunlap@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: alsa-devel@alsa-project.org, Randy Dunlap <rdunlap@infradead.org>,
Zzy Wysm <zzy@zzywysm.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
target-devel@vger.kernel.org, Dave Jiang <dave.jiang@intel.com>,
linux-scsi@vger.kernel.org, linux-nvdimm@lists.01.org,
Vishal Verma <vishal.l.verma@intel.com>,
Chuck Lever <chuck.lever@oracle.com>,
linux-input@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
Dan Williams <dan.j.williams@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-nfs@vger.kernel.org,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Takashi Iwai <tiwai@suse.com>,
linux-usb@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Johannes Berg <johannes@sipsolutions.net>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [RFC PATCH 0/9] fix -Wempty-body build warnings
Date: Sat, 18 Apr 2020 11:41:02 -0700 [thread overview]
Message-ID: <20200418184111.13401-1-rdunlap@infradead.org> (raw)
Hi,
When -Wextra is used, gcc emits many warnings about an empty 'if' or
'else' body, like this:
../fs/posix_acl.c: In function ‘get_acl’:
../fs/posix_acl.c:127:22: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
/* fall through */ ;
^
To quieten these warnings, add a new macro "do_empty()".
I originally wanted to use do_nothing(), but that's already in use.
It would sorta be nice if "fallthrough" could be coerced for this
instead of using something like do_empty().
Or should we just use "{}" in place of ";"?
This causes some odd coding style issue IMO. E.g., see this change:
original:
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
/* fall through */ ;
with new macro:
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
do_empty(); /* fall through */
using {}:
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
{} /* fall through */
or
{ /* fall through */ }
or even
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
/* fall through */ }
or
if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
} /* fall through */
drivers/base/devcoredump.c | 5 +++--
drivers/dax/bus.c | 5 +++--
drivers/input/mouse/synaptics.c | 3 ++-
drivers/target/target_core_pscsi.c | 3 ++-
drivers/usb/core/sysfs.c | 2 +-
fs/nfsd/nfs4state.c | 3 ++-
fs/posix_acl.c | 2 +-
include/linux/kernel.h | 8 ++++++++
sound/drivers/vx/vx_core.c | 3 ++-
9 files changed, 24 insertions(+), 10 deletions(-)
next reply other threads:[~2020-04-18 18:44 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-18 18:41 Randy Dunlap [this message]
2020-04-18 18:41 ` [RFC PATCH 1/9] kernel.h: add do_empty() macro Randy Dunlap
2020-04-18 18:44 ` Joe Perches
2020-04-18 18:49 ` Randy Dunlap
2020-04-18 22:20 ` Bart Van Assche
2020-04-18 22:24 ` Randy Dunlap
2020-04-18 18:41 ` [PATCH 2/9] fs: fix empty-body warning in posix_acl.c Randy Dunlap
2020-04-18 18:53 ` Linus Torvalds
2020-04-18 18:55 ` Randy Dunlap
2020-04-20 19:58 ` [PATCH 2/9] " Zzy Wysm
2020-04-18 18:41 ` [PATCH 3/9] input: fix empty-body warning in synaptics.c Randy Dunlap
2020-04-18 18:41 ` [PATCH 4/9] sound: fix empty-body warning in vx_core.c Randy Dunlap
2020-04-18 18:41 ` [PATCH 5/9] usb: fix empty-body warning in sysfs.c Randy Dunlap
2020-04-18 18:44 ` Matthew Wilcox
2020-04-18 18:46 ` Randy Dunlap
2020-04-18 19:54 ` Alan Stern
2020-04-21 1:20 ` NeilBrown
2020-04-21 13:58 ` Alan Stern
2020-04-18 18:41 ` [PATCH 6/9] nfsd: fix empty-body warning in nfs4state.c Randy Dunlap
2020-04-18 18:45 ` Chuck Lever
2020-04-18 18:53 ` Joe Perches
2020-04-18 18:57 ` Randy Dunlap
2020-04-18 22:28 ` Trond Myklebust
2020-04-18 22:32 ` Randy Dunlap
2020-04-18 22:33 ` Chuck Lever
2020-04-19 9:32 ` Sergei Shtylyov
2020-04-18 18:41 ` [PATCH 7/9] drivers/base: fix empty-body warnings in devcoredump.c Randy Dunlap
2020-04-18 18:50 ` Matthew Wilcox
2020-04-18 18:53 ` Randy Dunlap
2020-04-18 18:55 ` Joe Perches
2020-04-18 19:13 ` Matthew Wilcox
2020-04-18 19:16 ` Johannes Berg
2020-04-18 19:15 ` Linus Torvalds
2020-04-19 12:03 ` Greg Kroah-Hartman
2020-04-19 6:02 ` Greg Kroah-Hartman
2020-04-19 6:04 ` Greg Kroah-Hartman
2020-04-18 18:41 ` [PATCH 8/9] dax: fix empty-body warnings in bus.c Randy Dunlap
2020-04-19 8:15 ` Christoph Hellwig
2020-04-18 18:41 ` [PATCH 9/9] target: fix empty-body warning in target_core_pscsi.c Randy Dunlap
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200418184111.13401-1-rdunlap@infradead.org \
--to=rdunlap@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=alsa-devel@alsa-project.org \
--cc=bfields@fieldses.org \
--cc=chuck.lever@oracle.com \
--cc=dan.j.williams@intel.com \
--cc=dave.jiang@intel.com \
--cc=dmitry.torokhov@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=johannes@sipsolutions.net \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-input@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-scsi@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=target-devel@vger.kernel.org \
--cc=tiwai@suse.com \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
--cc=vishal.l.verma@intel.com \
--cc=zzy@zzywysm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).