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cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL

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Impact: cleanup

(Thanks to Al Viro for reminding me of this, via Ingo)

CPU_MASK_ALL is the (deprecated) "all bits set" cpumask, defined as so:

	#define CPU_MASK_ALL (cpumask_t) { { ... } }

Taking the address of such a temporary is questionable at best,
unfortunately 321a8e9d (cpumask: add CPU_MASK_ALL_PTR macro) added
CPU_MASK_ALL_PTR:

	#define CPU_MASK_ALL_PTR (&CPU_MASK_ALL)

Which formalizes this practice.  One day gcc could bite us over this
usage (though we seem to have gotten away with it so far).

So replace everywhere which used &CPU_MASK_ALL or CPU_MASK_ALL_PTR
with the modern "cpu_all_mask" (a real const struct cpumask *).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Ingo Molnar <mingo@elte.hu>
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mike Travis <travis@sgi.com>
This commit is contained in:
Rusty Russell 2009-03-30 22:05:10 -06:00
parent 0d34fb8e93
commit 1a2142afa5
4 changed files with 5 additions and 5 deletions
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2
init/main.c
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@ -842,7 +842,7 @@ static int __init kernel_init(void * unused)
/*
* init can run on any cpu.
*/
set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
set_cpus_allowed_ptr(current, cpu_all_mask);
/*
* Tell the world that we're going to be the grim
* reaper of innocent orphaned children.

2
kernel/kmod.c
View file

@ -167,7 +167,7 @@ static int ____call_usermodehelper(void *data)
}
/* We can run anywhere, unlike our parent keventd(). */
set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
set_cpus_allowed_ptr(current, cpu_all_mask);
/*
* Our parent is keventd, which runs with elevated scheduling priority.

4
kernel/kthread.c
View file

@ -110,7 +110,7 @@ static void create_kthread(struct kthread_create_info *create)
*/
sched_setscheduler(create->result, SCHED_NORMAL, &param);
set_user_nice(create->result, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(create->result, CPU_MASK_ALL_PTR);
set_cpus_allowed_ptr(create->result, cpu_all_mask);
}
complete(&create->done);
}
@ -240,7 +240,7 @@ int kthreadd(void *unused)
set_task_comm(tsk, "kthreadd");
ignore_signals(tsk);
set_user_nice(tsk, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(tsk, CPU_MASK_ALL_PTR);
set_cpus_allowed_ptr(tsk, cpu_all_mask);
current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;

2
mm/pdflush.c
View file

@ -191,7 +191,7 @@ static int pdflush(void *dummy)
/*
* Some configs put our parent kthread in a limited cpuset,
* which kthread() overrides, forcing cpus_allowed == CPU_MASK_ALL.
* which kthread() overrides, forcing cpus_allowed == cpu_all_mask.
* Our needs are more modest - cut back to our cpusets cpus_allowed.
* This is needed as pdflush's are dynamically created and destroyed.
* The boottime pdflush's are easily placed w/o these 2 lines.