77 lines
2.3 KiB
Diff
77 lines
2.3 KiB
Diff
From b78529ca6a695c4b328e2cb24eb16b3d8dfe0b27 Mon Sep 17 00:00:00 2001
|
|
Message-Id: <b78529ca6a695c4b328e2cb24eb16b3d8dfe0b27.1596234183.git.zanussi@kernel.org>
|
|
In-Reply-To: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
|
|
References: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
Date: Tue, 12 Jul 2011 11:39:36 +0200
|
|
Subject: [PATCH 177/329] mm/vmalloc: Another preempt disable region which
|
|
sucks
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.135-rt60.tar.xz
|
|
|
|
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 | 13 ++++++++-----
|
|
1 file changed, 8 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
|
|
index 1817871b0239..aa06badc76f4 100644
|
|
--- a/mm/vmalloc.c
|
|
+++ b/mm/vmalloc.c
|
|
@@ -853,7 +853,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
|
|
struct vmap_block *vb;
|
|
struct vmap_area *va;
|
|
unsigned long vb_idx;
|
|
- int node, err;
|
|
+ int node, err, cpu;
|
|
void *vaddr;
|
|
|
|
node = numa_node_id();
|
|
@@ -896,11 +896,12 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
|
|
BUG_ON(err);
|
|
radix_tree_preload_end();
|
|
|
|
- vbq = &get_cpu_var(vmap_block_queue);
|
|
+ cpu = 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;
|
|
}
|
|
@@ -969,6 +970,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
|
|
struct vmap_block *vb;
|
|
void *vaddr = NULL;
|
|
unsigned int order;
|
|
+ int cpu;
|
|
|
|
BUG_ON(offset_in_page(size));
|
|
BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
|
|
@@ -983,7 +985,8 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
|
|
order = get_order(size);
|
|
|
|
rcu_read_lock();
|
|
- vbq = &get_cpu_var(vmap_block_queue);
|
|
+ cpu = get_cpu_light();
|
|
+ vbq = this_cpu_ptr(&vmap_block_queue);
|
|
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
|
|
unsigned long pages_off;
|
|
|
|
@@ -1006,7 +1009,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
|
|
break;
|
|
}
|
|
|
|
- put_cpu_var(vmap_block_queue);
|
|
+ put_cpu_light();
|
|
rcu_read_unlock();
|
|
|
|
/* Allocate new block if nothing was found */
|
|
--
|
|
2.17.1
|
|
|