linux-kernel - Re: [PATCH v24 01/12] Linux Random Number Generator

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Date:   Wed, 13 Nov 2019 01:25:58 +0100
From:   Stephan Müller <smueller@...onox.de>
To:     kbuild test robot <lkp@...el.com>
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>
Subject: Re: [PATCH v24 01/12] Linux Random Number Generator

Am Mittwoch, 13. November 2019, 01:14:05 CET schrieb kbuild test robot:

Hi kbuild,

> Hi "Stephan,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on char-misc/char-misc-testing]
> [also build test ERROR on v5.4-rc7 next-20191112]
> [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-ap
> proach-with-full-SP800-90B-compliance/20191113-040847 base:  
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
> 01b59c763fe2de845b65900485b141fdd7bbf93e config: mips-allmodconfig
> (attached as .config)
> compiler: mips-linux-gcc (GCC) 7.4.0
> reproduce:
>         wget
> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
> ~/bin/make.cross chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.4.0 make.cross ARCH=mips
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    drivers/char/lrng/lrng_sw_noise.c: In function 
'add_interrupt_randomness':
> >> drivers/char/lrng/lrng_sw_noise.c:145:23: error: invalid application of
> >> 'sizeof' to incomplete type 'struct pt_regs'
>        size_t n = (sizeof(struct pt_regs) / sizeof(u32));
>                           ^~~~~~
> 
> >> drivers/char/lrng/lrng_sw_noise.c:147:9: error: implicit declaration of
> >> function 'instruction_pointer'; did you mean 'instruction_hazard'?
> >> [-Werror=implicit-function-declaration]
>        ip = instruction_pointer(regs);
>             ^~~~~~~~~~~~~~~~~~~
>             instruction_hazard
>    cc1: some warnings being treated as errors
> 
> vim +145 drivers/char/lrng/lrng_sw_noise.c

Thank you for the report.

Both issues are fixed by including <asm/ptrace.h>.

This will be fixed with the next installment of the patch.
> 
>    125
>    126	/**
>    127	 * Hot code path - Callback for interrupt handler
>    128	 */
>    129	void add_interrupt_randomness(int irq, int irq_flags)
>    130	{
>    131		lrng_time_process();
>    132
>    133		if (!lrng_pool_highres_timer()) {
>    134			struct pt_regs *regs = get_irq_regs();
>    135			static atomic_t reg_idx = ATOMIC_INIT(0);
>    136			u64 ip;
>    137
>    138			lrng_pool_lfsr_u32(jiffies);
>    139			lrng_pool_lfsr_u32(irq);
>    140			lrng_pool_lfsr_u32(irq_flags);
>    141
>    142			if (regs) {
>    143				u32 *ptr = (u32 *)regs;
>    144				int reg_ptr = atomic_add_return_relaxed(1, 
&reg_idx);
> 
>  > 145				size_t n = (sizeof(struct pt_regs) / 
sizeof(u32));
> 
>    146
> 
>  > 147				ip = instruction_pointer(regs);
> 
> ---
> 0-DAY kernel test infrastructure                 Open Source Technology
> Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel
> Corporation


Ciao
Stephan