x86: integrate delay functions.

delay_32.c, delay_64.c are now equal, and are integrated into delay.c.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 76f60f5..86960a6 100644 (file)
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_SMP) := msr-on-cpu.o
 
-lib-y := delay_$(BITS).o
+lib-y := delay.o
 lib-y += usercopy_$(BITS).o getuser_$(BITS).o putuser_$(BITS).o
 lib-y += memcpy_$(BITS).o
 

diff --git a/arch/x86/lib/delay_32.c b/arch/x86/lib/delay.c
similarity index 98%
rename from arch/x86/lib/delay_32.c
rename to arch/x86/lib/delay.c
index 0b659a3..f456860 100644 (file)
--- a/arch/x86/lib/delay_32.c
+++ b/arch/x86/lib/delay.c
@@ -29,7 +29,7 @@
 /* simple loop based delay: */
 static void delay_loop(unsigned long loops)
 {
-       __asm__ __volatile__(
+       asm volatile(
                "       test %0,%0      \n"
                "       jz 3f           \n"
                "       jmp 1f          \n"
@@ -108,31 +108,30 @@ void __delay(unsigned long loops)
 {
        delay_fn(loops);
 }
+EXPORT_SYMBOL(__delay);
 
 inline void __const_udelay(unsigned long xloops)
 {
        int d0;
 
        xloops *= 4;
-       __asm__("mull %%edx"
+       asm("mull %%edx"
                :"=d" (xloops), "=&a" (d0)
                :"1" (xloops), "0"
                (cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
 
        __delay(++xloops);
 }
+EXPORT_SYMBOL(__const_udelay);
 
 void __udelay(unsigned long usecs)
 {
        __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
 }
+EXPORT_SYMBOL(__udelay);
 
 void __ndelay(unsigned long nsecs)
 {
        __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
 }
-
-EXPORT_SYMBOL(__delay);
-EXPORT_SYMBOL(__const_udelay);
-EXPORT_SYMBOL(__udelay);
 EXPORT_SYMBOL(__ndelay);

diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c
deleted file mode 100644 (file)
index ff3dfec..0000000
--- a/arch/x86/lib/delay_64.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- *     Precise Delay Loops for x86-64
- *
- *     Copyright (C) 1993 Linus Torvalds
- *     Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
- *
- *     The __delay function must _NOT_ be inlined as its execution time
- *     depends wildly on alignment on many x86 processors. 
- */
-
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/timex.h>
-#include <linux/preempt.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-
-#include <asm/delay.h>
-#include <asm/msr.h>
-
-#ifdef CONFIG_SMP
-#include <asm/smp.h>
-#endif
-
-/* simple loop based delay: */
-static void delay_loop(unsigned long loops)
-{
-       asm volatile(
-               "       test %0,%0      \n"
-               "       jz 3f           \n"
-               "       jmp 1f          \n"
-
-               ".align 16              \n"
-               "1:     jmp 2f          \n"
-
-               ".align 16              \n"
-               "2:     dec %0          \n"
-               "       jnz 2b          \n"
-               "3:     dec %0          \n"
-
-               : /* we don't need output */
-               :"a" (loops)
-       );
-}
-
-static void delay_tsc(unsigned long loops)
-{
-       unsigned bclock, now;
-       int cpu;
-
-       preempt_disable();
-       cpu = smp_processor_id();
-       rdtscl(bclock);
-       for (;;) {
-               rdtscl(now);
-               if ((now - bclock) >= loops)
-                       break;
-
-               /* Allow RT tasks to run */
-               preempt_enable();
-               rep_nop();
-               preempt_disable();
-
-               /*
-                * It is possible that we moved to another CPU, and
-                * since TSC's are per-cpu we need to calculate
-                * that. The delay must guarantee that we wait "at
-                * least" the amount of time. Being moved to another
-                * CPU could make the wait longer but we just need to
-                * make sure we waited long enough. Rebalance the
-                * counter for this CPU.
-                */
-               if (unlikely(cpu != smp_processor_id())) {
-                       loops -= (now - bclock);
-                       cpu = smp_processor_id();
-                       rdtscl(bclock);
-               }
-       }
-       preempt_enable();
-}
-
-static void (*delay_fn)(unsigned long) = delay_loop;
-
-void use_tsc_delay(void)
-{
-       delay_fn = delay_tsc;
-}
-
-int __devinit read_current_timer(unsigned long *timer_value)
-{
-       if (delay_fn == delay_tsc) {
-               rdtscll(*timer_value);
-               return 0;
-       }
-       return -1;
-}
-
-void __delay(unsigned long loops)
-{
-       delay_fn(loops);
-}
-EXPORT_SYMBOL(__delay);
-
-inline void __const_udelay(unsigned long xloops)
-{
-       int d0;
-       xloops *= 4;
-       __asm__("mull %%edx"
-               :"=d" (xloops), "=&a" (d0)
-               :"1" (xloops), "0"
-               (cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
-
-       __delay(++xloops);
-}
-
-EXPORT_SYMBOL(__const_udelay);
-
-void __udelay(unsigned long usecs)
-{
-       __const_udelay(usecs * 0x000010c7);  /* 2**32 / 1000000 (rounded up) */
-}
-EXPORT_SYMBOL(__udelay);
-
-void __ndelay(unsigned long nsecs)
-{
-       __const_udelay(nsecs * 0x00005);  /* 2**32 / 1000000000 (rounded up) */
-}
-EXPORT_SYMBOL(__ndelay);