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Subject[PATCH 07/12] cpuset: modify cpuset_set_cpus_allowed to use cpumask pointer
  * Modify cpuset_cpus_allowed to return the currently allowed cpuset
via a pointer argument instead of as the function return value.

* Use new set_cpus_allowed_ptr function.

* Cleanup CPU_MASK_ALL and NODE_MASK_ALL uses.

Depends on:
[sched-devel]: sched: add new set_cpus_allowed_ptr function

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ x86/latest .../x86/linux-2.6-x86.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git

Signed-off-by: Mike Travis <travis@sgi.com>
---
include/linux/cpuset.h | 13 +++++++------
kernel/cpuset.c | 31 ++++++++++++-------------------
kernel/sched.c | 8 +++++---
mm/pdflush.c | 4 ++--
4 files changed, 26 insertions(+), 30 deletions(-)
--- linux-2.6.x86.orig/include/linux/cpuset.h
+++ linux-2.6.x86/include/linux/cpuset.h
@@ -20,8 +20,8 @@ extern int number_of_cpusets; /* How man
extern int cpuset_init_early(void);
extern int cpuset_init(void);
extern void cpuset_init_smp(void);
-extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
-extern cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p);
+extern void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask);
+extern void cpuset_cpus_allowed_locked(struct task_struct *p, cpumask_t *mask);
extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
#define cpuset_current_mems_allowed (current->mems_allowed)
void cpuset_init_current_mems_allowed(void);
@@ -86,13 +86,14 @@ static inline int cpuset_init_early(void
static inline int cpuset_init(void) { return 0; }
static inline void cpuset_init_smp(void) {}

-static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
+static inline void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask)
{
- return cpu_possible_map;
+ *mask = cpu_possible_map;
}
-static inline cpumask_t cpuset_cpus_allowed_locked(struct task_struct *p)
+static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
+ cpumask_t *mask)
{
- return cpu_possible_map;
+ *mask = cpu_possible_map;
}

static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
--- linux-2.6.x86.orig/kernel/cpuset.c
+++ linux-2.6.x86/kernel/cpuset.c
@@ -741,7 +741,7 @@ int cpuset_test_cpumask(struct task_stru
*/
void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
{
- set_cpus_allowed(tsk, (cgroup_cs(scan->cg))->cpus_allowed);
+ set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
}

/**
@@ -1269,7 +1269,7 @@ static void cpuset_attach(struct cgroup_

mutex_lock(&callback_mutex);
guarantee_online_cpus(cs, &cpus);
- set_cpus_allowed(tsk, cpus);
+ set_cpus_allowed_ptr(tsk, &cpus);
mutex_unlock(&callback_mutex);

from = oldcs->mems_allowed;
@@ -1663,8 +1663,8 @@ static struct cgroup_subsys_state *cpuse
set_bit(CS_SPREAD_SLAB, &cs->flags);
set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
set_bit(CS_SYSTEM, &cs->flags);
- cs->cpus_allowed = CPU_MASK_NONE;
- cs->mems_allowed = NODE_MASK_NONE;
+ cpus_clear(cs->cpus_allowed);
+ nodes_clear(cs->mems_allowed);
cs->mems_generation = cpuset_mems_generation++;
fmeter_init(&cs->fmeter);

@@ -1737,8 +1737,8 @@ int __init cpuset_init(void)
{
int err = 0;

- top_cpuset.cpus_allowed = CPU_MASK_ALL;
- top_cpuset.mems_allowed = NODE_MASK_ALL;
+ cpus_setall(top_cpuset.cpus_allowed);
+ nodes_setall(top_cpuset.mems_allowed);

fmeter_init(&top_cpuset.fmeter);
top_cpuset.mems_generation = cpuset_mems_generation++;
@@ -1957,6 +1957,7 @@ void __init cpuset_init_smp(void)

* cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset.
* @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
+ * @pmask: pointer to cpumask_t variable to receive cpus_allowed set.
*
* Description: Returns the cpumask_t cpus_allowed of the cpuset
* attached to the specified @tsk. Guaranteed to return some non-empty
@@ -1964,35 +1965,27 @@ void __init cpuset_init_smp(void)
* tasks cpuset.
**/

-cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
+void cpuset_cpus_allowed(struct task_struct *tsk, cpumask_t *pmask)
{
- cpumask_t mask;
-
mutex_lock(&callback_mutex);
- mask = cpuset_cpus_allowed_locked(tsk);
+ cpuset_cpus_allowed_locked(tsk, pmask);
mutex_unlock(&callback_mutex);
-
- return mask;
}

/**
* cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
* Must be called with callback_mutex held.
**/
-cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk)
+void cpuset_cpus_allowed_locked(struct task_struct *tsk, cpumask_t *pmask)
{
- cpumask_t mask;
-
task_lock(tsk);
- guarantee_online_cpus(task_cs(tsk), &mask);
+ guarantee_online_cpus(task_cs(tsk), pmask);
task_unlock(tsk);
-
- return mask;
}

void cpuset_init_current_mems_allowed(void)
{
- current->mems_allowed = NODE_MASK_ALL;
+ nodes_setall(current->mems_allowed);
}

/**
--- linux-2.6.x86.orig/kernel/sched.c
+++ linux-2.6.x86/kernel/sched.c
@@ -4996,13 +4996,13 @@ long sched_setaffinity(pid_t pid, cpumas
if (retval)
goto out_unlock;

- cpus_allowed = cpuset_cpus_allowed(p);
+ cpuset_cpus_allowed(p, &cpus_allowed);
cpus_and(new_mask, new_mask, cpus_allowed);
again:
retval = set_cpus_allowed(p, new_mask);

if (!retval) {
- cpus_allowed = cpuset_cpus_allowed(p);
+ cpuset_cpus_allowed(p, &cpus_allowed);
if (!cpus_subset(new_mask, cpus_allowed)) {
/*
* We must have raced with a concurrent cpuset
@@ -5719,7 +5719,9 @@ static void move_task_off_dead_cpu(int d

/* No more Mr. Nice Guy. */
if (dest_cpu >= nr_cpu_ids) {
- cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p);
+ cpumask_t cpus_allowed;
+
+ cpuset_cpus_allowed_locked(p, &cpus_allowed);
/*
* Try to stay on the same cpuset, where the
* current cpuset may be a subset of all cpus.
--- linux-2.6.x86.orig/mm/pdflush.c
+++ linux-2.6.x86/mm/pdflush.c
@@ -187,8 +187,8 @@ static int pdflush(void *dummy)
* This is needed as pdflush's are dynamically created and destroyed.
* The boottime pdflush's are easily placed w/o these 2 lines.
*/
- cpus_allowed = cpuset_cpus_allowed(current);
- set_cpus_allowed(current, cpus_allowed);
+ cpuset_cpus_allowed(current, &cpus_allowed);
+ set_cpus_allowed_ptr(current, &cpus_allowed);

return __pdflush(&my_work);
}
--


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