77 lines
2.3 KiB
Diff
77 lines
2.3 KiB
Diff
From 32dcb68778d490393e793053f19a2bf407762aec Mon Sep 17 00:00:00 2001
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Message-Id: <32dcb68778d490393e793053f19a2bf407762aec.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 12 Jul 2011 11:39:36 +0200
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Subject: [PATCH 177/333] mm/vmalloc: Another preempt disable region which
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sucks
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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Avoid the preempt disable version of get_cpu_var(). The inner-lock should
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provide enough serialisation.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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mm/vmalloc.c | 13 ++++++++-----
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1 file changed, 8 insertions(+), 5 deletions(-)
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diff --git a/mm/vmalloc.c b/mm/vmalloc.c
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index 1817871b0239..aa06badc76f4 100644
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--- a/mm/vmalloc.c
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+++ b/mm/vmalloc.c
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@@ -853,7 +853,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
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struct vmap_block *vb;
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struct vmap_area *va;
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unsigned long vb_idx;
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- int node, err;
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+ int node, err, cpu;
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void *vaddr;
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node = numa_node_id();
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@@ -896,11 +896,12 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
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BUG_ON(err);
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radix_tree_preload_end();
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- vbq = &get_cpu_var(vmap_block_queue);
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+ cpu = get_cpu_light();
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+ vbq = this_cpu_ptr(&vmap_block_queue);
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spin_lock(&vbq->lock);
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list_add_tail_rcu(&vb->free_list, &vbq->free);
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spin_unlock(&vbq->lock);
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- put_cpu_var(vmap_block_queue);
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+ put_cpu_light();
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return vaddr;
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}
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@@ -969,6 +970,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
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struct vmap_block *vb;
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void *vaddr = NULL;
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unsigned int order;
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+ int cpu;
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BUG_ON(offset_in_page(size));
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BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
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@@ -983,7 +985,8 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
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order = get_order(size);
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rcu_read_lock();
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- vbq = &get_cpu_var(vmap_block_queue);
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+ cpu = get_cpu_light();
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+ vbq = this_cpu_ptr(&vmap_block_queue);
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list_for_each_entry_rcu(vb, &vbq->free, free_list) {
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unsigned long pages_off;
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@@ -1006,7 +1009,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
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break;
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}
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- put_cpu_var(vmap_block_queue);
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+ put_cpu_light();
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rcu_read_unlock();
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/* Allocate new block if nothing was found */
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--
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2.17.1
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