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- #ifndef _LINUX_DELAY_H
- #define _LINUX_DELAY_H
-
- /*
- * Copyright (C) 1993 Linus Torvalds
- *
- * Delay routines, using a pre-computed "loops_per_second" value.
- */
-
- extern unsigned long loops_per_sec;
-
- #include <asm/delay.h>
-
- /*
- * Using udelay() for intervals greater than a few milliseconds can
- * risk overflow for high loops_per_sec (high bogomips) machines. The
- * mdelay() provides a wrapper to prevent this. For delays greater
- * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
- * specific values can be defined in asm-???/delay.h as an override.
- * The 2nd mdelay() definition ensures GCC will optimize away the
- * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
- */
-
- #ifndef MAX_UDELAY_MS
- #define MAX_UDELAY_MS 5
- #endif
-
- #ifdef notdef
- #define mdelay(n) (\
- {unsigned long msec=(n); while (msec--) udelay(1000);})
- #else
- #define mdelay(n) (\
- (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
- ({unsigned long msec=(n); while (msec--) udelay(1000);}))
- #endif
-
- #endif /* defined(_LINUX_DELAY_H) */
-