#ifndef _PHNT_NTDEF_H
#ifndef _NTDEF_
#if defined(__INTELLISENSE__) || defined(DOXYGEN)
#ifndef ALIGN_UP_BY

/**
 * The ALIGN_UP_BY macro aligns a value up to a specified alignment boundary.
 *
 * \param Length    The value to align.
 * \param Alignment The alignment boundary in bytes (typically a power of two).
 * \return @p Length rounded up to the nearest multiple of @p Alignment.
 * \remarks This uses ALIGN_DOWN_BY after adding (@p Alignment - 1).
 */
#define ALIGN_UP_BY(Length, Alignment) (ALIGN_DOWN_BY(((ULONG_PTR)(Length) + (Alignment) - 1), Alignment))

#endif
#endif
#endif
#endif
View code on GitHub

#ifndef _PHNT_NTDEF_H
#ifndef _NTDEF_
#if defined(__INTELLISENSE__) || defined(DOXYGEN)
// ...
#else
#ifndef ALIGN_UP_BY

#define ALIGN_UP_BY(Length, Alignment) (ALIGN_DOWN_BY(((ULONG_PTR)(Length) + (Alignment) - 1), Alignment))

#endif
#endif
#endif
#endif
View code on GitHub