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uprobes: __copy_insn() needs "loff_t offset"

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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 <[email protected]>
Acked-by: Srikar Dronamraju <[email protected]>
Acked-by: Ananth N Mavinakayanahalli <[email protected]>
Cc: Anton Arapov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Oleg Nesterov 2012-06-15 17:43:59 +02:00 • committed by Ingo Molnar
commit 593609a596
1 changed files with 6 additions and 6 deletions
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12
kernel/events/uprobes.c
View file

@ -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);