linux-kernel - [PATCH 3/3] uprobes: simplify the usage of uprobe->pending

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Date:	Wed, 30 May 2012 18:58:46 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] uprobes: simplify the usage of uprobe->pending_list

uprobe->pending_list is only used to create the temporary list,
it has no meaning after we drop uprobes_mmap_hash(inode).

No need to initialize this node or remove it from tmp_list, and
we can use list_for_each_entry().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/events/uprobes.c |   12 ++++--------
 1 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 50c8a9c..de931e7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -529,7 +529,6 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset)
 	uprobe->inode = igrab(inode);
 	uprobe->offset = offset;
 	init_rwsem(&uprobe->consumer_rwsem);
-	INIT_LIST_HEAD(&uprobe->pending_list);
 
 	/* add to uprobes_tree, sorted on inode:offset */
 	cur_uprobe = insert_uprobe(uprobe);
@@ -1051,7 +1050,7 @@ static void build_probe_list(struct inode *inode, struct list_head *head)
 int uprobe_mmap(struct vm_area_struct *vma)
 {
 	struct list_head tmp_list;
-	struct uprobe *uprobe, *u;
+	struct uprobe *uprobe;
 	struct inode *inode;
 	int ret, count;
 
@@ -1069,10 +1068,9 @@ int uprobe_mmap(struct vm_area_struct *vma)
 	ret = 0;
 	count = 0;
 
-	list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
+	list_for_each_entry(uprobe, &tmp_list, pending_list) {
 		loff_t vaddr;
 
-		list_del(&uprobe->pending_list);
 		if (!ret) {
 			vaddr = vma_address(vma, uprobe->offset);
 
@@ -1118,7 +1116,7 @@ int uprobe_mmap(struct vm_area_struct *vma)
 void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 {
 	struct list_head tmp_list;
-	struct uprobe *uprobe, *u;
+	struct uprobe *uprobe;
 	struct inode *inode;
 
 	if (!atomic_read(&uprobe_events) || !valid_vma(vma, false))
@@ -1135,12 +1133,10 @@ void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned lon
 	mutex_lock(uprobes_mmap_hash(inode));
 	build_probe_list(inode, &tmp_list);
 
-	list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
+	list_for_each_entry(uprobe, &tmp_list, pending_list) {
 		loff_t vaddr;
 
-		list_del(&uprobe->pending_list);
 		vaddr = vma_address(vma, uprobe->offset);
-
 		if (vaddr >= start && vaddr < end) {
 			/*
 			 * An unregister could have removed the probe before
-- 
1.5.5.1


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