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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2005-11-05 02:02:54 +0900
committerRalf Baechle <ralf@linux-mips.org>2005-11-07 18:05:39 +0000
commita0f08209c685b4f7dccaf013da74e0e80986c477 (patch)
tree4226fd9fc00daa4db855ba5df0e12e990f55efe6 /include
parent53c2df2f4ebbc1d8231ca7cc13ac5381230888b1 (diff)
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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')
-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 85435a8d4e5..48d00cccdaf 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)
#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 */