linux-kernel - Re: [PATCH v5 2/2] powerpc/rtas: Implement reentrant rtas call

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Message-ID: <202005162058.jXEFKrf7%lkp@intel.com>
Date:   Sat, 16 May 2020 20:15:28 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Nadav Amit <namit@...are.com>
Cc:     kbuild-all@...ts.01.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] powerpc/rtas: Implement reentrant rtas call

Hi Leonardo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on v5.7-rc5 next-20200515]
[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/Leonardo-Bras/Implement-reentrant-rtas-call/20200516-132358
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc64-randconfig-r006-20200515 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
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
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=powerpc64 

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

arch/powerpc/kernel/rtas.c: In function 'rtas_call_reentrant':
>> arch/powerpc/kernel/rtas.c:519:9: error: 'local_paca' undeclared (first use in this function); did you mean 'local_inc'?
519 |  args = local_paca->reentrant_args;
|         ^~~~~~~~~~
|         local_inc
arch/powerpc/kernel/rtas.c:519:9: note: each undeclared identifier is reported only once for each function it appears in

vim +519 arch/powerpc/kernel/rtas.c

   486	
   487	/**
   488	 * rtas_call_reentrant() - Used for reentrant rtas calls
   489	 * @token:	Token for desired reentrant RTAS call
   490	 * @nargs:	Number of Input Parameters
   491	 * @nret:	Number of Output Parameters
   492	 * @outputs:	Array of outputs
   493	 * @...:	Inputs for desired RTAS call
   494	 *
   495	 * According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
   496	 * "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
   497	 * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
   498	 * PACA one instead.
   499	 *
   500	 * Return:	-1 on error,
   501	 *		First output value of RTAS call if (nret > 0),
   502	 *		0 otherwise,
   503	 */
   504	
   505	int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
   506	{
   507		va_list list;
   508		struct rtas_args *args;
   509		unsigned long flags;
   510		int i, ret = 0;
   511	
   512		if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
   513			return -1;
   514	
   515		local_irq_save(flags);
   516		preempt_disable();
   517	
   518		/* We use the per-cpu (PACA) rtas args buffer */
 > 519		args = local_paca->reentrant_args;
   520	
   521		va_start(list, outputs);
   522		va_rtas_call_unlocked(args, token, nargs, nret, list);
   523		va_end(list);
   524	
   525		if (nret > 1 && outputs)
   526			for (i = 0; i < nret - 1; ++i)
   527				outputs[i] = be32_to_cpu(args->rets[i + 1]);
   528	
   529		if (nret > 0)
   530			ret = be32_to_cpu(args->rets[0]);
   531	
   532		local_irq_restore(flags);
   533		preempt_enable();
   534	
   535		return ret;
   536	}
   537	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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