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Define MAX_UDELAY_MS

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If HZ was 1000, mdelay(2) cause overflow on multiplication in
__udelay.  We should define MAX_UDELAY_MS properly to prevent this.
    
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2005-11-05 02:02:54 +09:00 committed by Ralf Baechle
parent 53c2df2f4e
commit a0f08209c6
1 changed files with 9 additions and 0 deletions
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9
include/asm-mips/delay.h
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@ -84,4 +84,13 @@ static inline void __udelay(unsigned long usecs, unsigned long lpj)
#define udelay(usecs) __udelay((usecs),__udelay_val) #define udelay(usecs) __udelay((usecs),__udelay_val)
/* make sure "usecs *= ..." in udelay do not overflow. */
#if HZ >= 1000
#define MAX_UDELAY_MS 1
#elif HZ <= 200
#define MAX_UDELAY_MS 5
#else
#define MAX_UDELAY_MS (1000 / HZ)
#endif
#endif /* _ASM_DELAY_H */ #endif /* _ASM_DELAY_H */