Mark Hull-Richter wrote:
However, I am now getting this odd content in the trace log (dmesg), and I cannot figure out what it is or why it is there. If anyone recognizes this situation, I invite comment and suggestions on how to eliminate or decipher it:
4296757675 pdflush(80): do_writepages: map>ops>wrtpgs ffffffffa0195ff5 4296757675 pdflush(80): mpage_writepages w/b index 49728 pages 256000 <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7> <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7> <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7> <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7> <7><7><7><7><7>__bio_add_page: 2x ph 88>128 || hw 88>88 || 360448>max ffffffff802525d8 generic_make_request(bio 000001017c745300) 50729472, 704 __make_request(q 00000101b9293870, bio 000001017c745300: sdc; 50729600, 704)
I am going to regret answering this, because it is not the right place for such questions. However...
I suspect you are misusing printk and the KERN_XXX prefixes (KERN_DEBUG, KERN_ERR, KERN_INFO, etc.) defined in include/linux/kernel.h. Try dropping the comma between the prefix and the message. That is:
printk(KERN_INFO "Hello World!\n");
rather than:
printk(KERN_INFO, "Hello World!\n");
I leave it an exercise for a for the reader to figure out what the difference is.
Cheers, Michael