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Subject: mm/vmalloc: Another preempt disable region which sucks
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue Jul 12 11:39:36 2011 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.3-rt21.tar.xz
From: Thomas Gleixner <tglx@linutronix.de>
Avoid the preempt disable version of get_cpu_var(). The inner-lock should
provide enough serialisation.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
mm/vmalloc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
---
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1918,11 +1918,12 @@ static void *new_vmap_block(unsigned int
return ERR_PTR(err);
}
- vbq = &get_cpu_var(vmap_block_queue);
+ get_cpu_light();
+ vbq = this_cpu_ptr(&vmap_block_queue);
spin_lock(&vbq->lock);
list_add_tail_rcu(&vb->free_list, &vbq->free);
spin_unlock(&vbq->lock);
- put_cpu_var(vmap_block_queue);
+ put_cpu_light();
return vaddr;
}
@@ -2001,7 +2002,8 @@ static void *vb_alloc(unsigned long size
order = get_order(size);
rcu_read_lock();
- vbq = &get_cpu_var(vmap_block_queue);
+ get_cpu_light();
+ vbq = this_cpu_ptr(&vmap_block_queue);
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
unsigned long pages_off;
@@ -2024,7 +2026,7 @@ static void *vb_alloc(unsigned long size
break;
}
- put_cpu_var(vmap_block_queue);
+ put_cpu_light();
rcu_read_unlock();
/* Allocate new block if nothing was found */
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