Subject: Re: Oddity in physio()
To: Ben Harris <firstname.lastname@example.org>
From: Jason R Thorpe <email@example.com>
Date: 05/29/2001 08:12:57
On Tue, May 29, 2001 at 02:03:17PM +0100, Ben Harris wrote:
> error = uvm_vslock(p, bp->b_data, todo,
> (flags & B_READ) ?
> VM_PROT_READ | VM_PROT_WRITE :
> Am I missing something really obvious, or is that B_READ test backwards?
A "read" from a device is a "write" to memory. Similarly, a "write" to
a device is a "read" from memory.
-- Jason R. Thorpe <firstname.lastname@example.org>