From: ratheesh kannoth <ratheesh.ksz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: linux-newbie
<linux-newbie-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-c-programming-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-modules-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: virtual -->physical --> virtual address
Date: Sat, 15 Oct 2011 12:31:08 +0530 [thread overview]
Message-ID: <CAGZFCEHW9Rpk8ZaFbaQPMeA_jOGFnFsnyqXg8QYJs+T+WpxpKw@mail.gmail.com> (raw)
{
virtual_addr1 = kmalloc(0x20, GFP_USER);
phy_addr1 = __pa(virtual_addr1 );
virtual_addr2 = ioremap(phy_addr1, 0x20 );
}
I noticed that virtual_addr1 is not equal to virtual_addr2. And if i
dereference virtual_addr2 ( *virtual_addr2 ),
kernel crash. What is wrong here ?
-Ratheesh
next reply other threads:[~2011-10-15 7:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-15 7:01 ratheesh kannoth [this message]
[not found] ` <CAGZFCEHW9Rpk8ZaFbaQPMeA_jOGFnFsnyqXg8QYJs+T+WpxpKw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-10-15 17:57 ` virtual -->physical --> virtual address Mirko Banchi
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