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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2005-11-04 12:02:54 -0500
committerRalf Baechle <ralf@linux-mips.org>2005-11-07 13:05:39 -0500
commita0f08209c685b4f7dccaf013da74e0e80986c477 (patch)
tree4226fd9fc00daa4db855ba5df0e12e990f55efe6 /include/asm-mips
parent53c2df2f4ebbc1d8231ca7cc13ac5381230888b1 (diff)
Define MAX_UDELAY_MS
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>
Diffstat (limited to 'include/asm-mips')
-rw-r--r--include/asm-mips/delay.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-mips/delay.h b/include/asm-mips/delay.h
index 85435a8d4e52..48d00cccdafa 100644
--- a/include/asm-mips/delay.h
+++ b/include/asm-mips/delay.h
@@ -84,4 +84,13 @@ static inline void __udelay(unsigned long usecs, unsigned long lpj)
84 84
85#define udelay(usecs) __udelay((usecs),__udelay_val) 85#define udelay(usecs) __udelay((usecs),__udelay_val)
86 86
87/* make sure "usecs *= ..." in udelay do not overflow. */
88#if HZ >= 1000
89#define MAX_UDELAY_MS 1
90#elif HZ <= 200
91#define MAX_UDELAY_MS 5
92#else
93#define MAX_UDELAY_MS (1000 / HZ)
94#endif
95
87#endif /* _ASM_DELAY_H */ 96#endif /* _ASM_DELAY_H */