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What can I access in return probe

Hi,

I am wondering if I can access arguments in my return probe ?
And also, how do I access return value ?
 
Whats wrong here ?

# stap -g pagecache.stp
ERROR: pointer dereference fault near identifier 'page_cache_pages' at
pagecache.stp:8:2


Thanks,
Badari

Attachment: pagecache.stp
Description: Text document

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