linux-kernel - Re: How to calculate page address to PFN in user space.

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Message-ID: <6977.1554499657@turing-police>
Date:   Fri, 05 Apr 2019 17:27:37 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Pankaj Suryawanshi <suryawanshipankaj@...oo.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kernelnewbies@...nelnewbies.org" <kernelnewbies@...nelnewbies.org>
Subject: Re: How to calculate page address to PFN in user space.

On Fri, 05 Apr 2019 10:54:47 -0000, Pankaj Suryawanshi said:

> I have PFN of all processes in user space, how to calculate page address to PFN.

*All* user processes?  That's going to be a lot of PFN's.  What problem are you trying
to solve here?

(Hint - under what cases does the kernel care about the PFN of *any* user page?)