Re: [PATCHv2 4/4] staging: android: ion: Add ioctl to query available heaps

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 09/01/2016 04:44 PM, kbuild test robot wrote:
Hi Laura,

[auto build test WARNING on next-20160825]
[cannot apply to staging/staging-testing v4.8-rc4 v4.8-rc3 v4.8-rc2 v4.8-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Laura-Abbott/staging-android-ion-Drop-heap-type-masks/20160902-071022
config: mips-allyesconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
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
        # save the attached .config to linux build tree
        make.cross ARCH=mips

All warnings (new ones prefixed by >>):

   drivers/staging/android/ion/ion.c: In function 'ion_query_heaps':
drivers/staging/android/ion/ion.c:1181:3: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      (struct ion_heap_data __user *)query->heaps;
      ^


botching-up-ioctls.txt says:

 * Pointers are __u64, cast from/to a uintprt_t on the userspace side and
   from/to a void __user * in the kernel. Try really hard not to delay this
   conversion or worse, fiddle the raw __u64 through your code since that
   diminishes the checking tools like sparse can provide.

This doesn't seem like it will work on 32-bit systems since you'll end up
with the warning above. Is there a better option or did I misunderstand
how that is supposed to work?

Thanks,
Laura

_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel



[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux