lkml.org 
[lkml]   [2012]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 1/3] uprobes: uprobes_treelock should not disable irqs
Nobody plays with uprobes_tree/uprobes_treelock in interrupt context,
no need to disable irqs.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/events/uprobes.c | 21 ++++++++-------------
1 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 25c0d74..abe077e 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -413,11 +413,10 @@ static struct uprobe *__find_uprobe(struct inode *inode, loff_t offset)
static struct uprobe *find_uprobe(struct inode *inode, loff_t offset)
{
struct uprobe *uprobe;
- unsigned long flags;

- spin_lock_irqsave(&uprobes_treelock, flags);
+ spin_lock(&uprobes_treelock);
uprobe = __find_uprobe(inode, offset);
- spin_unlock_irqrestore(&uprobes_treelock, flags);
+ spin_unlock(&uprobes_treelock);

return uprobe;
}
@@ -464,12 +463,11 @@ static struct uprobe *__insert_uprobe(struct uprobe *uprobe)
*/
static struct uprobe *insert_uprobe(struct uprobe *uprobe)
{
- unsigned long flags;
struct uprobe *u;

- spin_lock_irqsave(&uprobes_treelock, flags);
+ spin_lock(&uprobes_treelock);
u = __insert_uprobe(uprobe);
- spin_unlock_irqrestore(&uprobes_treelock, flags);
+ spin_unlock(&uprobes_treelock);

/* For now assume that the instruction need not be single-stepped */
uprobe->flags |= UPROBE_SKIP_SSTEP;
@@ -707,11 +705,9 @@ remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, unsigned long vad
*/
static void delete_uprobe(struct uprobe *uprobe)
{
- unsigned long flags;
-
- spin_lock_irqsave(&uprobes_treelock, flags);
+ spin_lock(&uprobes_treelock);
rb_erase(&uprobe->rb_node, &uprobes_tree);
- spin_unlock_irqrestore(&uprobes_treelock, flags);
+ spin_unlock(&uprobes_treelock);
iput(uprobe->inode);
put_uprobe(uprobe);
atomic_dec(&uprobe_events);
@@ -969,7 +965,6 @@ static void build_probe_list(struct inode *inode,
struct list_head *head)
{
loff_t min, max;
- unsigned long flags;
struct rb_node *n, *t;
struct uprobe *u;

@@ -977,7 +972,7 @@ static void build_probe_list(struct inode *inode,
min = vaddr_to_offset(vma, start);
max = min + (end - start) - 1;

- spin_lock_irqsave(&uprobes_treelock, flags);
+ spin_lock(&uprobes_treelock);
n = find_node_in_range(inode, min, max);
if (n) {
for (t = n; t; t = rb_prev(t)) {
@@ -995,7 +990,7 @@ static void build_probe_list(struct inode *inode,
atomic_inc(&u->ref);
}
}
- spin_unlock_irqrestore(&uprobes_treelock, flags);
+ spin_unlock(&uprobes_treelock);
}

/*
--
1.5.5.1


\
 
 \ /
  Last update: 2012-08-19 19:01    [W:0.109 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site