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kmap!

Hi ,
The readpage of all Filesystem has got code like
 if (inode->i_size <= ((obd_off)page->index) <<
PAGE_SHIFT) {
                CERROR("reading beyond EOF\n");
                memset(kmap(page), 0, PAGE_SIZE);
                kunmap(page);
                SetPageUptodate(page);
                GOTO(out, rc = 0);
        }
Please somebody give me reason why this kmap when we
have to kunmap it in next line.
Thanks
Prasanna


		
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