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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-20 10:57:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-20 10:57:40 -0700
commit1eb51c33b21ffa3fceb634d1d6bcd6488c79bc26 (patch)
tree5360e0b439b35a97313ea8250209e7dacff8b9a6
parentb0b7065b64fe517b4a50915a1555e8ee98890d64 (diff)
parent3104bf03a923c72043a9c5009d9cd56724304916 (diff)
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: Fix out of scope variable access in sched_slice() sched: Hide runqueues from direct refer at source code level sched: Remove unneeded __ref tag sched, x86: Fix cpufreq + sched_clock() TSC scaling
-rw-r--r--arch/x86/include/asm/timer.h6
-rw-r--r--arch/x86/kernel/tsc.c8
-rw-r--r--kernel/sched.c2
-rw-r--r--kernel/sched_cpupri.c2
-rw-r--r--kernel/sched_debug.c6
-rw-r--r--kernel/sched_fair.c3
6 files changed, 18 insertions, 9 deletions
diff --git a/arch/x86/include/asm/timer.h b/arch/x86/include/asm/timer.h
index bd37ed444a21..20ca9c4d4686 100644
--- a/arch/x86/include/asm/timer.h
+++ b/arch/x86/include/asm/timer.h
@@ -45,12 +45,16 @@ extern int no_timer_check;
*/
DECLARE_PER_CPU(unsigned long, cyc2ns);
+DECLARE_PER_CPU(unsigned long long, cyc2ns_offset);
#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
static inline unsigned long long __cycles_2_ns(unsigned long long cyc)
{
- return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR;
+ int cpu = smp_processor_id();
+ unsigned long long ns = per_cpu(cyc2ns_offset, cpu);
+ ns += cyc * per_cpu(cyc2ns, cpu) >> CYC2NS_SCALE_FACTOR;
+ return ns;
}
static inline unsigned long long cycles_2_ns(unsigned long long cyc)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index b0597ad02c93..6e1a368d21d4 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -590,22 +590,26 @@ EXPORT_SYMBOL(recalibrate_cpu_khz);
*/
DEFINE_PER_CPU(unsigned long, cyc2ns);
+DEFINE_PER_CPU(unsigned long long, cyc2ns_offset);
static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
{
- unsigned long long tsc_now, ns_now;
+ unsigned long long tsc_now, ns_now, *offset;
unsigned long flags, *scale;
local_irq_save(flags);
sched_clock_idle_sleep_event();
scale = &per_cpu(cyc2ns, cpu);
+ offset = &per_cpu(cyc2ns_offset, cpu);
rdtscll(tsc_now);
ns_now = __cycles_2_ns(tsc_now);
- if (cpu_khz)
+ if (cpu_khz) {
*scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
+ *offset = ns_now - (tsc_now * *scale >> CYC2NS_SCALE_FACTOR);
+ }
sched_clock_idle_wakeup_event(0);
local_irq_restore(flags);
diff --git a/kernel/sched.c b/kernel/sched.c
index 247fd0fedd0b..92e51287b980 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7822,7 +7822,7 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
free_rootdomain(old_rd);
}
-static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
+static int init_rootdomain(struct root_domain *rd, bool bootmem)
{
gfp_t gfp = GFP_KERNEL;
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index 7deffc9f0e5f..e6c251790dde 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -152,7 +152,7 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri)
*
* Returns: -ENOMEM if memory fails.
*/
-int __init_refok cpupri_init(struct cpupri *cp, bool bootmem)
+int cpupri_init(struct cpupri *cp, bool bootmem)
{
gfp_t gfp = GFP_KERNEL;
int i;
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 467ca72f1657..70c7e0b79946 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -162,7 +162,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
{
s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
spread, rq0_min_vruntime, spread0;
- struct rq *rq = &per_cpu(runqueues, cpu);
+ struct rq *rq = cpu_rq(cpu);
struct sched_entity *last;
unsigned long flags;
@@ -191,7 +191,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
if (last)
max_vruntime = last->vruntime;
min_vruntime = cfs_rq->min_vruntime;
- rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
+ rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
spin_unlock_irqrestore(&rq->lock, flags);
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
SPLIT_NS(MIN_vruntime));
@@ -248,7 +248,7 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
static void print_cpu(struct seq_file *m, int cpu)
{
- struct rq *rq = &per_cpu(runqueues, cpu);
+ struct rq *rq = cpu_rq(cpu);
#ifdef CONFIG_X86
{
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5f9650e8fe75..ba7fd6e9556f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -430,12 +430,13 @@ static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
for_each_sched_entity(se) {
struct load_weight *load;
+ struct load_weight lw;
cfs_rq = cfs_rq_of(se);
load = &cfs_rq->load;
if (unlikely(!se->on_rq)) {
- struct load_weight lw = cfs_rq->load;
+ lw = cfs_rq->load;
update_load_add(&lw, se->load.weight);
load = &lw;