From: Thiemo Seufer <ths@networkno.de>
To: Daniel Laird <danieljlaird@hotmail.com>
Cc: linux-mips@linux-mips.org
Subject: Re: PAGE_ALIGN + PAGE_SHIFT from userspace
Date: Mon, 18 Dec 2006 12:47:00 +0000 [thread overview]
Message-ID: <20061218124659.GA17301@networkno.de> (raw)
In-Reply-To: <7925460.post@talk.nabble.com>
Daniel Laird wrote:
>
> Hi All,
>
> I was using linux 2.6.17.13 on my MIPS and it was all going well. I am just
> porting to 2.6.19 and am having a couple of issues.
>
> My first issue is that i used to mmap a buffer from user space. I used to
> use a PAGE_ALIGN macro when doing this:
> /** to align the pointer to the (next) page boundary */
> #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
>
> this worked as PAGE_SIZE and PAGE_MASK were available in page.h.
It didn't work reliably since the pagesize is a kernel configuration option.
> This have now been moved inside the #ifdef KERNEL guard in the header file.
> Meaning these are no longer available.
>
> Are these available somewhere else?
> Should I be doing something different to mmap?
Use the libc's sysconf(_SC_PAGESIZE) function.
Thiemo
next prev parent reply other threads:[~2006-12-18 13:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-18 9:04 PAGE_ALIGN + PAGE_SHIFT from userspace Daniel Laird
2006-12-18 12:47 ` Thiemo Seufer [this message]
2006-12-19 8:18 ` Daniel Laird
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