linux程序编译问题
# makemake -C /lib/modules/2.6.32-279.el6.i686/build M=/home/czx/arm-usb/usb2 modules
make: Entering directory `/usr/src/kernels/2.6.32-279.el6.i686'
CC /home/czx/arm-usb/usb2/usb-skeleton-xiao.o
/home/czx/arm-usb/usb2/usb-skeleton-xiao.c: In function ‘skel_write_bulk_callback’:
/home/czx/arm-usb/usb2/usb-skeleton-xiao.c:423: error: implicit declaration of function ‘usb_free_coherent’
/home/czx/arm-usb/usb2/usb-skeleton-xiao.c: In function ‘skel_write’:
/home/czx/arm-usb/usb2/usb-skeleton-xiao.c:478: error: implicit declaration of function ‘usb_alloc_coherent’
/home/czx/arm-usb/usb2/usb-skeleton-xiao.c:479: warning: assignment makes pointer from integer without a cast
make: *** Error 1
make: *** Error 2
make: Leaving directory `/usr/src/kernels/2.6.32-279.el6.i686'
make: *** Error 2
usb_free_coheren是usb.h中的函数，文件包含了usb.h文件，是什么问题呢？
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