commit a0f08209c685b4f7dccaf013da74e0e80986c477
author Atsushi Nemoto <anemo@mba.ocn.ne.jp> Sat Nov 05 02:02:54 2005 +0900
committer Ralf Baechle <ralf@linux-mips.org> Mon Nov 07 18:05:39 2005 +0000
tree 4226fd9fc00daa4db855ba5df0e12e990f55efe6
parent 53c2df2f4ebbc1d8231ca7cc13ac5381230888b1

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>

include/asm-mips/delay.h

diff --git a/include/asm-mips/delay.h b/include/asm-mips/delay.h
index 85435a8..48d00cc 100644
--- a/include/asm-mips/delay.h
+++ b/include/asm-mips/delay.h
@@ -84,4 +84,13 @@
 
 #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 */