Release 4.9 drivers/gpu/drm/nouveau/include/nvif/unpack.h
  
  
#ifndef __NVIF_UNPACK_H__
#define __NVIF_UNPACK_H__
#define nvif_unvers(r,d,s,m) ({                                                \
        void **_data = (d); __u32 *_size = (s); int _ret = (r);                \
        if (_ret == -ENOSYS && *_size == sizeof(m)) {                          \
                *_data = NULL;                                                 \
                *_size = _ret = 0;                                             \
        }                                                                      \
        _ret;                                                                  \
})
#define nvif_unpack(r,d,s,m,vl,vh,x) ({                                        \
        void **_data = (d); __u32 *_size = (s);                                \
        int _ret = (r), _vl = (vl), _vh = (vh);                                \
        if (_ret == -ENOSYS && *_size >= sizeof(m) &&                          \
            (m).version >= _vl && (m).version <= _vh) {                        \
                *_data = (__u8 *)*_data + sizeof(m);                           \
                *_size = *_size - sizeof(m);                                   \
                if (_ret = 0, !(x)) {                                          \
                        _ret = *_size ? -E2BIG : 0;                            \
                        *_data = NULL;                                         \
                        *_size = 0;                                            \
                }                                                              \
        }                                                                      \
        _ret;                                                                  \
})
#endif
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