linux-kernel - [tip:WIP.sched/core 101/122] drivers/misc/cxl/fault.c:228:10: warning: assignment makes pointer from integer without a cast

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Date:   Fri, 3 Feb 2017 07:37:01 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 101/122] drivers/misc/cxl/fault.c:228:10:
 warning: assignment makes pointer from integer without a cast

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   a69a38e26e87ddbe993e33b55f693405cd62c76f
commit: 18722d63da35b5846c7d79eedd1b35f46eefea07 [101/122] sched/headers, signals: Separate out task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h>
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 18722d63da35b5846c7d79eedd1b35f46eefea07
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All warnings (new ones prefixed by >>):

   drivers/misc/cxl/fault.c: In function 'get_mem_context':
   drivers/misc/cxl/fault.c:228:12: error: implicit declaration of function 'next_thread' [-Werror=implicit-function-declaration]
        task = next_thread(task);
               ^~~~~~~~~~~
>> drivers/misc/cxl/fault.c:228:10: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
        task = next_thread(task);
             ^
   drivers/misc/cxl/fault.c:229:22: error: implicit declaration of function 'thread_group_leader' [-Werror=implicit-function-declaration]
       } while (task && !thread_group_leader(task));
                         ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +228 drivers/misc/cxl/fault.c

7b8ad495 Vaibhav Jain 2015-11-24  212  	 * If we couldn't find the mm context then use the group
7b8ad495 Vaibhav Jain 2015-11-24  213  	 * leader to iterate over the task group and find a task
7b8ad495 Vaibhav Jain 2015-11-24  214  	 * that gives us mm_struct.
7b8ad495 Vaibhav Jain 2015-11-24  215  	 */
7b8ad495 Vaibhav Jain 2015-11-24  216  	if (unlikely(mm == NULL && ctx->glpid != NULL)) {
7b8ad495 Vaibhav Jain 2015-11-24  217  
7b8ad495 Vaibhav Jain 2015-11-24  218  		rcu_read_lock();
7b8ad495 Vaibhav Jain 2015-11-24  219  		task = pid_task(ctx->glpid, PIDTYPE_PID);
7b8ad495 Vaibhav Jain 2015-11-24  220  		if (task)
7b8ad495 Vaibhav Jain 2015-11-24  221  			do {
7b8ad495 Vaibhav Jain 2015-11-24  222  				mm = get_task_mm(task);
7b8ad495 Vaibhav Jain 2015-11-24  223  				if (mm) {
7b8ad495 Vaibhav Jain 2015-11-24  224  					ctx->pid = get_task_pid(task,
7b8ad495 Vaibhav Jain 2015-11-24  225  								PIDTYPE_PID);
7b8ad495 Vaibhav Jain 2015-11-24  226  					break;
7b8ad495 Vaibhav Jain 2015-11-24  227  				}
7b8ad495 Vaibhav Jain 2015-11-24 @228  				task = next_thread(task);
7b8ad495 Vaibhav Jain 2015-11-24  229  			} while (task && !thread_group_leader(task));
7b8ad495 Vaibhav Jain 2015-11-24  230  		rcu_read_unlock();
7b8ad495 Vaibhav Jain 2015-11-24  231  
7b8ad495 Vaibhav Jain 2015-11-24  232  		/* check if we switched pid */
7b8ad495 Vaibhav Jain 2015-11-24  233  		if (ctx->pid != old_pid) {
7b8ad495 Vaibhav Jain 2015-11-24  234  			if (mm)
7b8ad495 Vaibhav Jain 2015-11-24  235  				pr_devel("%s:pe=%i switch pid %i->%i\n",
7b8ad495 Vaibhav Jain 2015-11-24  236  					 __func__, ctx->pe, pid_nr(old_pid),

:::::: The code at line 228 was first introduced by commit
:::::: 7b8ad495d59280b634a7b546f4cdf58cf4d65f61 cxl: Fix DSI misses when the context owning task exits

:::::: TO: Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>
:::::: CC: Michael Ellerman <mpe@...erman.id.au>

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