diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-03-24 18:37:48 +0100 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-04-04 13:57:05 +0200 |
| commit | 2edb7b5574d447354202ba365fb8ca6a1bac1d1c (patch) | |
| tree | b26cd1b630261aa7507652975a32510d1a987ee6 /kernel/events | |
| parent | ab0d805c7b9089f9a9b291f33ab95301d6604868 (diff) | |
uprobes: Change __copy_insn() to use copy_from_page()
Change __copy_insn() to use copy_from_page() and simplify the code.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/uprobes.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 850eb9eb179..ba6acfe7c0d 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -500,30 +500,21 @@ __copy_insn(struct address_space *mapping, struct file *filp, char *insn, unsigned long nbytes, loff_t offset) { struct page *page; - void *vaddr; - unsigned long off; - pgoff_t idx; if (!filp) return -EINVAL; if (!mapping->a_ops->readpage) return -EIO; - - idx = offset >> PAGE_CACHE_SHIFT; - off = offset & ~PAGE_MASK; - /* * Ensure that the page that has the original instruction is * populated and in page-cache. */ - page = read_mapping_page(mapping, idx, filp); + page = read_mapping_page(mapping, offset >> PAGE_CACHE_SHIFT, filp); if (IS_ERR(page)) return PTR_ERR(page); - vaddr = kmap_atomic(page); - memcpy(insn, vaddr + off, nbytes); - kunmap_atomic(vaddr); + copy_from_page(page, offset, insn, nbytes); page_cache_release(page); return 0; |