Commit-ID: 593609a59600c8377f311b300f14deacb155b9a4
Gitweb: http://git.kernel.org/tip/593609a59600c8377f311b300f14deacb155b9a4
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Fri, 15 Jun 2012 17:43:59 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 16 Jun 2012 09:10:49 +0200
uprobes: __copy_insn() needs "loff_t offset"
1. __copy_insn() needs "loff_t offset", not "unsigned long",
to read the file.
2. use pgoff_t for "idx" and remove the unnecessary typecast.
3. fix the typo, "&=" is not what we want
4. can't resist, rename off1 to off.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Anton Arapov <anton@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20120615154359.GA9625@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/events/uprobes.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 4df84b7..d1b2eeb 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -581,12 +581,12 @@ static bool consumer_del(struct uprobe *uprobe, struct uprobe_consumer *uc)
static int
__copy_insn(struct address_space *mapping, struct file *filp, char *insn,
- unsigned long nbytes, unsigned long offset)
+ unsigned long nbytes, loff_t offset)
{
struct page *page;
void *vaddr;
- unsigned long off1;
- unsigned long idx;
+ unsigned long off;
+ pgoff_t idx;
if (!filp)
return -EINVAL;
@@ -594,8 +594,8 @@ __copy_insn(struct address_space *mapping, struct file *filp, char *insn,
if (!mapping->a_ops->readpage)
return -EIO;
- idx = (unsigned long)(offset >> PAGE_CACHE_SHIFT);
- off1 = offset &= ~PAGE_MASK;
+ idx = offset >> PAGE_CACHE_SHIFT;
+ off = offset & ~PAGE_MASK;
/*
* Ensure that the page that has the original instruction is
@@ -606,7 +606,7 @@ __copy_insn(struct address_space *mapping, struct file *filp, char *insn,
return PTR_ERR(page);
vaddr = kmap_atomic(page);
- memcpy(insn, vaddr + off1, nbytes);
+ memcpy(insn, vaddr + off, nbytes);
kunmap_atomic(vaddr);
page_cache_release(page);
--
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