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work around the remaining race condition in the tsc sched stuff

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SVN-Revision: 2503
This commit is contained in:
Felix Fietkau 2005-11-15 19:24:51 +00:00
parent b5eda794a8
commit 2e1a511a33
2 changed files with 24 additions and 10 deletions
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17
openwrt/target/linux/linux-2.4/patches/ar7/006-sched_use_tsc.patch
View file

@ -1,7 +1,7 @@
diff -urN linux.old/arch/mips/kernel/time.c linux.dev/arch/mips/kernel/time.c
--- linux.old/arch/mips/kernel/time.c 2005-11-14 11:06:38.661262000 +0100
+++ linux.dev/arch/mips/kernel/time.c 2005-11-15 15:21:17.890005500 +0100
@@ -151,6 +151,20 @@
+++ linux.dev/arch/mips/kernel/time.c 2005-11-15 20:02:50.059676750 +0100
@@ -151,6 +151,27 @@
unsigned int (*mips_hpt_read)(void);
void (*mips_hpt_init)(unsigned int);
@ -10,19 +10,26 @@ diff -urN linux.old/arch/mips/kernel/time.c linux.dev/arch/mips/kernel/time.c
+ return timerhi;
+}
+
+static __u64 tscll_last = 0;
+
+extern __u64 get_tscll(void)
+{
+ __u32 c = read_c0_count();
+ __u64 h = (__u64) timerhi;
+ h += (c < timerlo);
+ __u32 c = read_c0_count();
+
+ h <<= 32;
+ h += c;
+
+ while (h < tscll_last)
+ h += (((__u64) 1) << 32);
+
+ tscll_last = h;
+ return h;
+}
/*
* timeofday services, for syscalls.
@@ -761,3 +775,5 @@
@@ -761,3 +782,5 @@
EXPORT_SYMBOL(to_tm);
EXPORT_SYMBOL(rtc_set_time);
EXPORT_SYMBOL(rtc_get_time);

17
openwrt/target/linux/linux-2.4/patches/brcm/007-sched_use_tsc.patch
View file

@ -1,7 +1,7 @@
diff -urN linux.old/arch/mips/kernel/time.c linux.dev/arch/mips/kernel/time.c
--- linux.old/arch/mips/kernel/time.c 2005-11-14 11:06:38.661262000 +0100
+++ linux.dev/arch/mips/kernel/time.c 2005-11-15 15:21:17.890005500 +0100
@@ -151,6 +151,20 @@
+++ linux.dev/arch/mips/kernel/time.c 2005-11-15 20:02:50.059676750 +0100
@@ -151,6 +151,27 @@
unsigned int (*mips_hpt_read)(void);
void (*mips_hpt_init)(unsigned int);
@ -10,19 +10,26 @@ diff -urN linux.old/arch/mips/kernel/time.c linux.dev/arch/mips/kernel/time.c
+ return timerhi;
+}
+
+static __u64 tscll_last = 0;
+
+extern __u64 get_tscll(void)
+{
+ __u32 c = read_c0_count();
+ __u64 h = (__u64) timerhi;
+ h += (c < timerlo);
+ __u32 c = read_c0_count();
+
+ h <<= 32;
+ h += c;
+
+ while (h < tscll_last)
+ h += (((__u64) 1) << 32);
+
+ tscll_last = h;
+ return h;
+}
/*
* timeofday services, for syscalls.
@@ -761,3 +775,5 @@
@@ -761,3 +782,5 @@
EXPORT_SYMBOL(to_tm);
EXPORT_SYMBOL(rtc_set_time);
EXPORT_SYMBOL(rtc_get_time);