kernel-ark/include/asm-ppc/unaligned.h

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#ifdef __KERNEL__
#ifndef __PPC_UNALIGNED_H
#define __PPC_UNALIGNED_H
/*
* The PowerPC can do unaligned accesses itself in big endian mode.
*
* The strange macros are there to make sure these can't
* be misused in a way that makes them not work on other
* architectures where unaligned accesses aren't as simple.
*/
#define get_unaligned(ptr) (*(ptr))
#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
#endif
#endif /* __KERNEL__ */