From 2edb7b5574d447354202ba365fb8ca6a1bac1d1c Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Sun, 24 Mar 2013 18:37:48 +0100 Subject: [PATCH] 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 Acked-by: Anton Arapov Acked-by: Srikar Dronamraju --- kernel/events/uprobes.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 850eb9eb179b..ba6acfe7c0de 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; -- 2.34.1