fs signed/unsigned error.

In file included from ../../../../../../device/lge/l1v/kernel/include/linux/thread_info.h:52:0,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/preempt.h:9,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/spinlock.h:50,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/mmzone.h:7,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/gfp.h:4,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/mm.h:8,
                 from ../../../../../../device/lge/l1v/kernel/fs/open.c:8:
../../../../../../device/lge/l1v/kernel/include/linux/bitops.h: In function 'hweight_long':
../../../../../../device/lge/l1v/kernel/include/linux/bitops.h:66:1145: warning: signed and unsigned type in conditional expression [-Wsign-compare]
error, forbidden warning: bitops.h:66
make[3]: *** [fs/open.o] Error 1
make[3]: *** Waiting for unfinished jobs....
  CC      arch/arm/mach-msm/clock-voter.o
  CC      kernel/itimer.o
In file included from ../../../../../../device/lge/l1v/kernel/include/linux/thread_info.h:52:0,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/preempt.h:9,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/spinlock.h:50,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/mmzone.h:7,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/gfp.h:4,
                 from ../../../../../../device/lge/l1v/kernel/include/linux/slab.h:12,
                 from ../../../../../../device/lge/l1v/kernel/fs/read_write.c:7:
../../../../../../device/lge/l1v/kernel/include/linux/bitops.h: In function 'hweight_long':
../../../../../../device/lge/l1v/kernel/include/linux/bitops.h:66:1145: warning: signed and unsigned type in conditional expression [-Wsign-compare]
error, forbidden warning: bitops.h:66
make[3]: *** [fs/read_write.o] Error 1
make[2]: *** [fs] Error 2
make[2]: *** Waiting for unfinished jobs....

make[1]: *** [sub-make] Error 2
make[1]: Leaving directory `/home/jacob/Desktop/cyan/device/lge/l1v/kernel'
make: *** [TARGET_KERNEL_BINARIES] Error 2
make: *** Waiting for unfinished jobs....
build error!
root@jacob-System-P



---------------
Errors above ^
preprocessed code below
---------------
static inline unsigned long hweight_long(unsigned long w)
{
        return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
}