Commit-ID: 816c03fbabe64fa09f66fbb64e932081af381415
Gitweb: http://git.kernel.org/tip/816c03fbabe64fa09f66fbb64e932081af381415
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Fri, 15 Jun 2012 17:43:55 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 16 Jun 2012 09:10:48 +0200
uprobes: Don't use loff_t for the valid virtual address
loff_t looks confusing when it is used for the virtual address.
Change map_info and install_breakpoint/remove_breakpoint paths
to use "unsigned long".
The patch doesn't change vma_address(), it can't return "long"
because it is used to verify the mapping. But probably this
needs some cleanups too.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Anton Arapov <anton@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20120615154355.GA9622@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/events/uprobes.c | 26 +++++++++-----------------
1 files changed, 9 insertions(+), 17 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 7d5c78f..4df84b7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -664,9 +664,8 @@ static int copy_insn(struct uprobe *uprobe, struct file *filp)
*/
static int
install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
- struct vm_area_struct *vma, loff_t vaddr)
+ struct vm_area_struct *vma, unsigned long vaddr)
{
- unsigned long addr;
int ret;
/*
@@ -679,8 +678,6 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
if (!uprobe->consumers)
return -EEXIST;
- addr = (unsigned long)vaddr;
-
if (!(uprobe->flags & UPROBE_COPY_INSN)) {
ret = copy_insn(uprobe, vma->vm_file);
if (ret)
@@ -689,7 +686,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
if (is_swbp_insn((uprobe_opcode_t *)uprobe->arch.insn))
return -ENOTSUPP;
- ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, addr);
+ ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
if (ret)
return ret;
@@ -709,7 +706,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
* Hence increment before and decrement on failure.
*/
atomic_inc(&mm->uprobes_state.count);
- ret = set_swbp(&uprobe->arch, mm, addr);
+ ret = set_swbp(&uprobe->arch, mm, vaddr);
if (ret)
atomic_dec(&mm->uprobes_state.count);
@@ -717,9 +714,9 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
}
static void
-remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, loff_t vaddr)
+remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, unsigned long vaddr)
{
- if (!set_orig_insn(&uprobe->arch, mm, (unsigned long)vaddr, true))
+ if (!set_orig_insn(&uprobe->arch, mm, vaddr, true))
atomic_dec(&mm->uprobes_state.count);
}
@@ -743,7 +740,7 @@ static void delete_uprobe(struct uprobe *uprobe)
struct map_info {
struct map_info *next;
struct mm_struct *mm;
- loff_t vaddr;
+ unsigned long vaddr;
};
static inline struct map_info *free_map_info(struct map_info *info)
@@ -837,7 +834,6 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
while (info) {
struct mm_struct *mm = info->mm;
struct vm_area_struct *vma;
- loff_t vaddr;
if (err)
goto free;
@@ -847,9 +843,8 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
if (!vma || !valid_vma(vma, is_register))
goto unlock;
- vaddr = vma_address(vma, uprobe->offset);
if (vma->vm_file->f_mapping->host != uprobe->inode ||
- vaddr != info->vaddr)
+ vma_address(vma, uprobe->offset) != info->vaddr)
goto unlock;
if (is_register) {
@@ -1055,10 +1050,8 @@ int uprobe_mmap(struct vm_area_struct *vma)
count = 0;
list_for_each_entry(uprobe, &tmp_list, pending_list) {
- loff_t vaddr;
-
if (!ret) {
- vaddr = vma_address(vma, uprobe->offset);
+ loff_t vaddr = vma_address(vma, uprobe->offset);
if (vaddr < vma->vm_start || vaddr >= vma->vm_end) {
put_uprobe(uprobe);
@@ -1122,9 +1115,8 @@ void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned lon
build_probe_list(inode, &tmp_list);
list_for_each_entry(uprobe, &tmp_list, pending_list) {
- loff_t vaddr;
+ loff_t vaddr = vma_address(vma, uprobe->offset);
- vaddr = vma_address(vma, uprobe->offset);
if (vaddr >= start && vaddr < end) {
/*
* An unregister could have removed the probe before
--
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