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Date: Thu, 17 Dec 2009 12:25:43 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Christoph Lameter <cl@...ux-foundation.org>,
linux-scsi@...r.kernel.org,
Andy Henroid <andrew.d.henroid@...el.com>,
Gautham R Shenoy <ego@...ibm.com>,
Ashok Raj <ashok.raj@...el.com>, Ingo Molnar <mingo@...e.hu>
Subject: [PULL] cpumask cleanups
The following changes since commit bea4c899f2b5fad80099aea979780ef19f9b1987:
Linus Torvalds (1):
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
are available in the git repository at:
ssh://master.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus.git cpumask-cleanups
Rusty Russell (7):
cpumask: use cpu_online in kernel/perf_event.c
cpumask: avoid deprecated function in mm/slab.c
cpumask: use modern cpumask style in drivers/scsi/fcoe/fcoe.c
cpumask: convert drivers/idle/i7300_idle.c to cpumask_var_t
cpumask: avoid dereferencing struct cpumask
cpumask: don't recommend set_cpus_allowed hack in Documentation/cpu-hotplug.txt
cpumask: rename tsk_cpumask to tsk_cpus_allowed
Documentation/cpu-hotplug.txt | 49 ++++++++++-------------------
arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 2 +-
drivers/idle/i7300_idle.c | 15 +++++---
drivers/scsi/fcoe/fcoe.c | 2 +-
include/linux/sched.h | 2 +-
kernel/perf_event.c | 2 +-
kernel/time/timer_list.c | 4 +-
mm/slab.c | 2 +-
8 files changed, 33 insertions(+), 45 deletions(-)
commit f6325e30ebd6fc870315b017a5d4a6ab15bf790b
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:08 2009 -0600
cpumask: use cpu_online in kernel/perf_event.c
Also, we want to check against nr_cpu_ids, not num_possible_cpus().
The latter works, but the correct bounds check is < nr_cpu_ids.
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
To: Thomas Gleixner <tglx@...utronix.de>
kernel/perf_event.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
commit 58463c1fe25f7c4183f30f06a5a86cb6cd9d8231
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:12 2009 -0600
cpumask: avoid deprecated function in mm/slab.c
These days we use cpumask_empty() which takes a pointer.
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Acked-by: Christoph Lameter <cl@...ux-foundation.org>
mm/slab.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
commit 6957177f5c3c0e51b9e90a1d7fadb3177a333949
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:14 2009 -0600
cpumask: use modern cpumask style in drivers/scsi/fcoe/fcoe.c
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Cc: "James E.J. Bottomley" <James.Bottomley@...e.de>
Cc: Robert Love <robert.w.love@...el.com>
Cc: Chris Leech <christopher.leech@...el.com>
Cc: linux-scsi@...r.kernel.org
drivers/scsi/fcoe/fcoe.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
commit cc216b86e51e9ab22265ea9591769c9ee235e1e4
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:24 2009 -0600
cpumask: convert drivers/idle/i7300_idle.c to cpumask_var_t
Fairly simple transformation:
1) cpumask_t -> cpumask_var_t and alloc_cpumask_var/free_cpumask_var
(which are a NOOP unless CONFIG_CPUMASK_OFFSTACK=y).
2) cpu_set -> cpumask_set_cpu
3) cpus_weight -> cpumask_weight
4) cpu_clear -> cpumask_clear_cpu
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
To: Andy Henroid <andrew.d.henroid@...el.com>
drivers/idle/i7300_idle.c | 15 +++++++++------
1 files changed, 9 insertions(+), 6 deletions(-)
commit 62ac12795095dc959649c66ace78708e7ac52477
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:26 2009 -0600
cpumask: avoid dereferencing struct cpumask
struct cpumask will be undefined soon with CONFIG_CPUMASK_OFFSTACK=y,
to avoid them being declared on the stack.
cpumask_bits() does what we want here (of course, this code is crap).
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
To: Thomas Gleixner <tglx@...utronix.de>
kernel/time/timer_list.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
commit 4251417484a1775ba5cbfe38c67e6d5af9615de4
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:29 2009 -0600
cpumask: don't recommend set_cpus_allowed hack in Documentation/cpu-hotplug.txt
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Cc: Gautham R Shenoy <ego@...ibm.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Documentation/cpu-hotplug.txt | 49 ++++++++++++++--------------------------
1 files changed, 17 insertions(+), 32 deletions(-)
commit a4636818f8e0991f32d9528f39cf4f3d6a7d30a3
Author: Rusty Russell <rusty@...tcorp.com.au>
Date: Thu Dec 17 11:43:29 2009 -0600
cpumask: rename tsk_cpumask to tsk_cpus_allowed
Noone uses this wrapper yet, and Ingo asked that it be kept consistent
with current task_struct usage.
(One user crept in via linux-next: fixed)
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au.
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Tejun Heo <tj@...nel.org>
arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 2 +-
include/linux/sched.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index 4d4a644..a99d703 100644
--- a/Documentation/cpu-hotplug.txt
+++ b/Documentation/cpu-hotplug.txt
@@ -315,41 +315,26 @@ A: The following are what is required for CPU hotplug infrastructure to work
Q: I need to ensure that a particular cpu is not removed when there is some
work specific to this cpu is in progress.
-A: First switch the current thread context to preferred cpu
+A: There are two ways. If your code can be run in interrupt context, use
+ smp_call_function_single(), otherwise use work_on_cpu(). Note that
+ work_on_cpu() is slow, and can fail due to out of memory:
int my_func_on_cpu(int cpu)
{
- cpumask_t saved_mask, new_mask = CPU_MASK_NONE;
- int curr_cpu, err = 0;
-
- saved_mask = current->cpus_allowed;
- cpu_set(cpu, new_mask);
- err = set_cpus_allowed(current, new_mask);
-
- if (err)
- return err;
-
- /*
- * If we got scheduled out just after the return from
- * set_cpus_allowed() before running the work, this ensures
- * we stay locked.
- */
- curr_cpu = get_cpu();
-
- if (curr_cpu != cpu) {
- err = -EAGAIN;
- goto ret;
- } else {
- /*
- * Do work : But cant sleep, since get_cpu() disables preempt
- */
- }
- ret:
- put_cpu();
- set_cpus_allowed(current, saved_mask);
- return err;
- }
-
+ int err;
+ get_online_cpus();
+ if (!cpu_online(cpu))
+ err = -EINVAL;
+ else
+#if NEEDS_BLOCKING
+ err = work_on_cpu(cpu, __my_func_on_cpu, NULL);
+#else
+ smp_call_function_single(cpu, __my_func_on_cpu, &err,
+ true);
+#endif
+ put_online_cpus();
+ return err;
+ }
Q: How do we determine how many CPUs are available for hotplug.
A: There is no clear spec defined way from ACPI that can give us that
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index a9df944..f125e5c 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -1136,7 +1136,7 @@ static int powernowk8_target(struct cpufreq_policy *pol,
if (!alloc_cpumask_var(&oldmask, GFP_KERNEL))
return -ENOMEM;
- cpumask_copy(oldmask, tsk_cpumask(current));
+ cpumask_copy(oldmask, tsk_cpus_allowed(current));
set_cpus_allowed_ptr(current, cpumask_of(pol->cpu));
if (smp_processor_id() != pol->cpu) {
diff --git a/drivers/idle/i7300_idle.c b/drivers/idle/i7300_idle.c
index 1f20a04..dd25300 100644
--- a/drivers/idle/i7300_idle.c
+++ b/drivers/idle/i7300_idle.c
@@ -81,7 +81,7 @@ static u8 i7300_idle_thrtctl_saved;
static u8 i7300_idle_thrtlow_saved;
static u32 i7300_idle_mc_saved;
-static cpumask_t idle_cpumask;
+static cpumask_var_t idle_cpumask;
static ktime_t start_ktime;
static unsigned long avg_idle_us;
@@ -459,9 +459,9 @@ static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val,
spin_lock_irqsave(&i7300_idle_lock, flags);
if (val == IDLE_START) {
- cpu_set(smp_processor_id(), idle_cpumask);
+ cpumask_set_cpu(smp_processor_id(), idle_cpumask);
- if (cpus_weight(idle_cpumask) != num_online_cpus())
+ if (cpumask_weight(idle_cpumask) != num_online_cpus())
goto end;
now_ktime = ktime_get();
@@ -478,8 +478,8 @@ static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val,
i7300_idle_ioat_start();
} else if (val == IDLE_END) {
- cpu_clear(smp_processor_id(), idle_cpumask);
- if (cpus_weight(idle_cpumask) == (num_online_cpus() - 1)) {
+ cpumask_clear_cpu(smp_processor_id(), idle_cpumask);
+ if (cpumask_weight(idle_cpumask) == (num_online_cpus() - 1)) {
/* First CPU coming out of idle */
u64 idle_duration_us;
@@ -553,7 +553,6 @@ struct debugfs_file_info {
static int __init i7300_idle_init(void)
{
spin_lock_init(&i7300_idle_lock);
- cpus_clear(idle_cpumask);
total_us = 0;
if (i7300_idle_platform_probe(&fbd_dev, &ioat_dev, forceload))
@@ -565,6 +564,9 @@ static int __init i7300_idle_init(void)
if (i7300_idle_ioat_init())
return -ENODEV;
+ if (!zalloc_cpumask_var(&idle_cpumask, GFP_KERNEL))
+ return -ENOMEM;
+
debugfs_dir = debugfs_create_dir("i7300_idle", NULL);
if (debugfs_dir) {
int i = 0;
@@ -589,6 +591,7 @@ static int __init i7300_idle_init(void)
static void __exit i7300_idle_exit(void)
{
idle_notifier_unregister(&i7300_idle_nb);
+ free_cpumask_var(idle_cpumask);
if (debugfs_dir) {
int i = 0;
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index a30ffaa..51c24b3 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1231,7 +1231,7 @@ int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
"CPU.\n");
spin_unlock_bh(&fps->fcoe_rx_list.lock);
- cpu = first_cpu(cpu_online_map);
+ cpu = cpumask_first(cpu_online_mask);
fps = &per_cpu(fcoe_percpu, cpu);
spin_lock_bh(&fps->fcoe_rx_list.lock);
if (!fps->thread) {
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 244c287..4d7adb2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1555,7 +1555,7 @@ struct task_struct {
};
/* Future-safe accessor for struct task_struct's cpus_allowed. */
-#define tsk_cpumask(tsk) (&(tsk)->cpus_allowed)
+#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
/*
* Priority of a process goes from 0..MAX_PRIO-1, valid RT
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 8ab8698..97d1a3d 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1614,7 +1614,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
* offline CPU and activate it when the CPU comes up, but
* that's for later.
*/
- if (!cpu_isset(cpu, cpu_online_map))
+ if (!cpu_online(cpu))
return ERR_PTR(-ENODEV);
cpuctx = &per_cpu(perf_cpu_context, cpu);
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 2826563..bdfb8dd 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -237,10 +237,10 @@ static void timer_list_show_tickdevices(struct seq_file *m)
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
print_tickdevice(m, tick_get_broadcast_device(), -1);
SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
- tick_get_broadcast_mask()->bits[0]);
+ cpumask_bits(tick_get_broadcast_mask())[0]);
#ifdef CONFIG_TICK_ONESHOT
SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
- tick_get_broadcast_oneshot_mask()->bits[0]);
+ cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
#endif
SEQ_printf(m, "\n");
#endif
diff --git a/mm/slab.c b/mm/slab.c
index 3f48229..7560eb0 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1132,7 +1132,7 @@ static void __cpuinit cpuup_canceled(long cpu)
if (nc)
free_block(cachep, nc->entry, nc->avail, node);
- if (!cpus_empty(*mask)) {
+ if (!cpumask_empty(mask)) {
spin_unlock_irq(&l3->list_lock);
goto free_array_cache;
}
--
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