linux-kernel - Re: [PATCH v27 04/12] LRNG - add switchable DRNG support

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Date:   Sat, 11 Jan 2020 15:09:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Stephan Müller <smueller@...onox.de>
Cc:     kbuild-all@...ts.01.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        "Theodore Y. Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Vito Caputo <vcaputo@...garu.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        zhangjs <zachary@...shancloud.com>,
        Andy Lutomirski <luto@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Nicolai Stange <nstange@...e.de>,
        "Peter, Matthias" <matthias.peter@....bund.de>,
        Marcelo Henrique Cerri <marcelo.cerri@...onical.com>,
        Roman Drahtmueller <draht@...altsekun.de>,
        Neil Horman <nhorman@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH v27 04/12] LRNG - add switchable DRNG support

Hi "Stephan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on cryptodev/master crypto/master v5.5-rc5 next-20200110]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Stephan-M-ller/dev-random-a-new-approach-with-full-SP800-90B/20200110-084934
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 68faa679b8be1a74e6663c21c3a9d25d32f1c079
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-129-g341daf20-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/char/lrng/lrng_internal.h:239:39: sparse: sparse: context imbalance in 'lrng_drng_switch' - unexpected unlock

vim +/lrng_drng_switch +239 drivers/char/lrng/lrng_internal.h

58c283819a1e87 Stephan Müller 2020-01-09  233  
58c283819a1e87 Stephan Müller 2020-01-09  234  /* Unlock the DRNG */
58c283819a1e87 Stephan Müller 2020-01-09  235  static __always_inline void lrng_drng_unlock(struct lrng_drng *drng,
58c283819a1e87 Stephan Müller 2020-01-09  236  					     unsigned long *flags)
58c283819a1e87 Stephan Müller 2020-01-09  237  {
58c283819a1e87 Stephan Müller 2020-01-09  238  	if (lrng_drng_is_atomic(drng))
58c283819a1e87 Stephan Müller 2020-01-09 @239  		spin_unlock_irqrestore(&drng->spin_lock, *flags);
58c283819a1e87 Stephan Müller 2020-01-09  240  	else
58c283819a1e87 Stephan Müller 2020-01-09  241  		mutex_unlock(&drng->lock);
58c283819a1e87 Stephan Müller 2020-01-09  242  }
58c283819a1e87 Stephan Müller 2020-01-09  243  

:::::: The code at line 239 was first introduced by commit
:::::: 58c283819a1e879bc2e30d05720285f9709f7f6d Linux Random Number Generator

:::::: TO: Stephan Müller <smueller@...onox.de>
:::::: CC: 0day robot <lkp@...el.com>

---
0-DAY kernel test infrastructure                 Open Source Technology Center
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