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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>
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@ -500,30 +500,21 @@ __copy_insn(struct address_space *mapping, struct file *filp, char *insn,
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unsigned long nbytes, loff_t offset)
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{
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struct page *page;
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void *vaddr;
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unsigned long off;
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pgoff_t idx;
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if (!filp)
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return -EINVAL;
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if (!mapping->a_ops->readpage)
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return -EIO;
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idx = offset >> PAGE_CACHE_SHIFT;
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off = offset & ~PAGE_MASK;
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/*
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* Ensure that the page that has the original instruction is
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* populated and in page-cache.
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*/
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page = read_mapping_page(mapping, idx, filp);
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page = read_mapping_page(mapping, offset >> PAGE_CACHE_SHIFT, filp);
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if (IS_ERR(page))
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return PTR_ERR(page);
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vaddr = kmap_atomic(page);
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memcpy(insn, vaddr + off, nbytes);
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kunmap_atomic(vaddr);
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copy_from_page(page, offset, insn, nbytes);
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page_cache_release(page);
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return 0;
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