linux-kernel - Re: [PATCH v8 2/2] staging/android: refactor SYNC IOCTLs

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Message-ID: <201603151722.rYtPwVAV%fengguang.wu@intel.com>
Date:	Tue, 15 Mar 2016 17:26:19 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Gustavo Padovan <gustavo@...ovan.org>
Cc:	kbuild-all@...org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, Rob Clark <robdclark@...il.com>,
	Daniel Stone <daniels@...labora.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Riley Andrews <riandrews@...roid.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Arve Hjønnevåg <arve@...roid.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	John Harrison <John.C.Harrison@...el.com>
Subject: Re: [PATCH v8 2/2] staging/android: refactor SYNC IOCTLs

Hi Gustavo,

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on next-20160315]
[cannot apply to v4.5]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Gustavo-Padovan/staging-android-remove-redundant-comments-on-sync_merge_data/20160315-051123
config: i386-randconfig-h1-03151610 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/linux/linkage.h:4:0,
                    from include/linux/fs.h:4,
                    from include/linux/debugfs.h:18,
                    from drivers/staging/android/sync.c:17:
   drivers/staging/android/sync.c: In function 'sync_file_ioctl_fence_info':
   drivers/staging/android/sync.c:535:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
                      ^
   include/linux/compiler.h:147:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> drivers/staging/android/sync.c:535:2: note: in expansion of macro 'if'
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
     ^
   drivers/staging/android/sync.c:535:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
                      ^
   include/linux/compiler.h:147:42: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                             ^
>> drivers/staging/android/sync.c:535:2: note: in expansion of macro 'if'
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
     ^
   drivers/staging/android/sync.c:535:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
                      ^
   include/linux/compiler.h:158:16: note: in definition of macro '__trace_if'
      ______r = !!(cond);     \
                   ^
>> drivers/staging/android/sync.c:535:2: note: in expansion of macro 'if'
     if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
     ^

vim +/if +535 drivers/staging/android/sync.c

   519		 * info->num_fences.
   520		 */
   521		if (!info.num_fences)
   522			goto no_fences;
   523	
   524		if (info.num_fences < sync_file->num_fences)
   525			return -EINVAL;
   526	
   527		size = sync_file->num_fences * sizeof(*fence_info);
   528		fence_info = kzalloc(size, GFP_KERNEL);
   529		if (!fence_info)
   530			return -ENOMEM;
   531	
   532		for (i = 0; i < sync_file->num_fences; ++i)
   533			sync_fill_fence_info(sync_file->cbs[i].fence, &fence_info[i]);
   534	
 > 535		if (copy_to_user((void __user *)info.sync_fence_info, fence_info,
   536				 size)) {
   537			ret = -EFAULT;
   538			goto out;
   539		}
   540	
   541	no_fences:
   542		strlcpy(info.name, sync_file->name, sizeof(info.name));
   543		info.status = atomic_read(&sync_file->status);

---
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