Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / include / asm-mips / delay.h

diff --git a/include/asm-mips/delay.h b/include/asm-mips/delay.h
index d0f6844..928f30f 100644 (file)
--- a/include/asm-mips/delay.h
+++ b/include/asm-mips/delay.h
@@ -12,29 +12,29 @@
 
 #include <linux/config.h>
 #include <linux/param.h>
-
+#include <linux/smp.h>
 #include <asm/compiler.h>
 
-extern unsigned long loops_per_jiffy;
-
 static inline void __delay(unsigned long loops)
 {
        if (sizeof(long) == 4)
                __asm__ __volatile__ (
-               ".set\tnoreorder\n"
-               "1:\tbnez\t%0,1b\n\t"
-               "subu\t%0,1\n\t"
-               ".set\treorder"
+               "       .set    noreorder                               \n"
+               "       .align  3                                       \n"
+               "1:     bnez    %0, 1b                                  \n"
+               "       subu    %0, 1                                   \n"
+               "       .set    reorder                                 \n"
                : "=r" (loops)
                : "0" (loops));
        else if (sizeof(long) == 8)
                __asm__ __volatile__ (
-               ".set\tnoreorder\n"
-               "1:\tbnez\t%0,1b\n\t"
-               "dsubu\t%0,1\n\t"
-               ".set\treorder"
-               :"=r" (loops)
-               :"0" (loops));
+               "       .set    noreorder                               \n"
+               "       .align  3                                       \n"
+               "1:     bnez    %0, 1b                                  \n"
+               "       dsubu   %0, 1                                   \n"
+               "       .set    reorder                                 \n"
+               : "=r" (loops)
+               : "0" (loops));
 }
 
 
@@ -54,14 +54,12 @@ static inline void __udelay(unsigned long usecs, unsigned long lpj)
        unsigned long lo;
 
        /*
-        * The common rates of 1000 and 128 are rounded wrongly by the
-        * catchall case for 64-bit.  Excessive precission?  Probably ...
+        * The rates of 128 is rounded wrongly by the catchall case
+        * for 64-bit.  Excessive precission?  Probably ...
         */
-#if defined(CONFIG_MIPS64) && (HZ == 128)
+#if defined(CONFIG_64BIT) && (HZ == 128)
        usecs *= 0x0008637bd05af6c7UL;          /* 2**64 / (1000000 / HZ) */
-#elif defined(CONFIG_MIPS64) && (HZ == 1000)
-       usecs *= 0x004189374BC6A7f0UL;          /* 2**64 / (1000000 / HZ) */
-#elif defined(CONFIG_MIPS64)
+#elif defined(CONFIG_64BIT)
        usecs *= (0x8000000000000000UL / (500000 / HZ));
 #else /* 32-bit junk follows here */
        usecs *= (unsigned long) (((0x8000000000000000ULL / (500000 / HZ)) +
@@ -82,12 +80,17 @@ static inline void __udelay(unsigned long usecs, unsigned long lpj)
        __delay(usecs);
 }
 
-#ifdef CONFIG_SMP
 #define __udelay_val cpu_data[smp_processor_id()].udelay_val
-#else
-#define __udelay_val loops_per_jiffy
-#endif
 
 #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 */