From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: root@chaos.analogic.com
Cc: "Srinivas G." <srinivasg@esntechnologies.co.in>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Having problem with mmap system call!!!
Date: Thu, 16 Sep 2004 21:01:16 +0100 [thread overview]
Message-ID: <1095364875.22750.45.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.53.0409161404001.13362@chaos>
On Iau, 2004-09-16 at 19:13, Richard B. Johnson wrote:
> for (i = 0; i < v->page_count; i++) {
> unsigned long page = virt_to_phys((void *)v->desc[i]);
> if (remap_page_range(start, page, PAGE_SIZE, PAGE_READONLY)) {
> err = -EAGAIN;
> goto out;
> }
> start += PAGE_SIZE;
Actually thats a nice example of how easy it is to implement mmap
properly.
> you usually say... Anyway are you aware that ...
>
> unsigned long size = vma->vm_end - vma->vm_start;
>
> ... ends up being 32 bytes longer than the length the user-mode
> code put into mmap()?
Its page aligned, that is what mmap() says happens.
next prev parent reply other threads:[~2004-09-16 21:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4EE0CBA31942E547B99B3D4BFAB348111078FE@mail.esn.co.in>
2004-09-16 14:07 ` Having problem with mmap system call!!! Richard B. Johnson
2004-09-16 13:31 ` Alan Cox
2004-09-16 14:54 ` Richard B. Johnson
2004-09-16 15:57 ` Alan Cox
2004-09-16 18:13 ` Richard B. Johnson
2004-09-16 20:01 ` Alan Cox [this message]
2004-09-16 14:42 Srinivas G.
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