The patch titled
cpuset: convert cpuset_attach() to use cpumask_var_t
has been removed from the -mm tree. Its filename was
cpuset-convert-cpuset_attach-to-use-cpumask_var_t.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpuset: convert cpuset_attach() to use cpumask_var_t
From: Li Zefan <lizf@xxxxxxxxxxxxxx>
Impact: reduce stack usage
Allocate a global cpumask_var_t at boot, and use it in cpuset_attach(), so
we won't fail cpuset_attach().
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Acked-by: Mike Travis <travis@xxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff -puN kernel/cpuset.c~cpuset-convert-cpuset_attach-to-use-cpumask_var_t kernel/cpuset.c
--- a/kernel/cpuset.c~cpuset-convert-cpuset_attach-to-use-cpumask_var_t
+++ a/kernel/cpuset.c
@@ -1306,6 +1306,9 @@ static int fmeter_getrate(struct fmeter
return val;
}
+/* Protected by cgroup_lock */
+static cpumask_var_t cpus_attach;
+
/* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */
static int cpuset_can_attach(struct cgroup_subsys *ss,
struct cgroup *cont, struct task_struct *tsk)
@@ -1330,7 +1333,6 @@ static void cpuset_attach(struct cgroup_
struct cgroup *cont, struct cgroup *oldcont,
struct task_struct *tsk)
{
- cpumask_t cpus;
nodemask_t from, to;
struct mm_struct *mm;
struct cpuset *cs = cgroup_cs(cont);
@@ -1338,13 +1340,13 @@ static void cpuset_attach(struct cgroup_
int err;
if (cs == &top_cpuset) {
- cpus = cpu_possible_map;
+ cpumask_copy(cpus_attach, cpu_possible_mask);
} else {
mutex_lock(&callback_mutex);
- guarantee_online_cpus(cs, &cpus);
+ guarantee_online_cpus(cs, cpus_attach);
mutex_unlock(&callback_mutex);
}
- err = set_cpus_allowed_ptr(tsk, &cpus);
+ err = set_cpus_allowed_ptr(tsk, cpus_attach);
if (err)
return;
@@ -1357,7 +1359,6 @@ static void cpuset_attach(struct cgroup_
cpuset_migrate_mm(mm, &from, &to);
mmput(mm);
}
-
}
/* The various types of files and directories in a cpuset file system */
@@ -1838,6 +1839,9 @@ int __init cpuset_init(void)
if (err < 0)
return err;
+ if (!alloc_cpumask_var(&cpus_attach, GFP_KERNEL))
+ BUG();
+
number_of_cpusets = 1;
return 0;
}
_
Patches currently in -mm which might be from lizf@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
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