From: mulyadi.santosa@gmail.com (Mulyadi Santosa)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Can we map a device address to two different memory locations?
Date: Sat, 28 May 2011 00:24:49 +0700 [thread overview]
Message-ID: <BANLkTimuYGkCEQ0nnKuivJS5uZO5WXq68g@mail.gmail.com> (raw)
In-Reply-To: <BANLkTikcp1GeX=WeD4Eei2DMobNXCxVa8A@mail.gmail.com>
Hi...
On Fri, May 27, 2011 at 17:49, sandeep kumar <coolsandyforyou@gmail.com> wrote:
> Now the question is can we memory map a one device resource(say some
> iomemory) to two different memory locations?
> the other way of seeing at this question is,
> Will ioremap() gives different 'virtual addresses' when called multiple
> times?
I agree with Daniel, but I suggest you to think about it: in reading
operation, maybe it's ok, no concurrency issues need to be taken
care...but how about writing? unless we're sure they are atomically or
uninterruptible, i see a chance that race condition might happen here.
Actually it's similar when you map a file into two different VMA and
write into it, correct?
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
next prev parent reply other threads:[~2011-05-27 17:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-27 10:49 Can we map a device address to two different memory locations? sandeep kumar
2011-05-27 15:34 ` Daniel Baluta
2011-05-27 17:24 ` Mulyadi Santosa [this message]
2011-05-27 17:48 ` anish singh
2011-05-27 18:01 ` Mulyadi Santosa
2011-05-28 12:24 ` Peter Teoh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=BANLkTimuYGkCEQ0nnKuivJS5uZO5WXq68g@mail.gmail.com \
--to=mulyadi.santosa@gmail.com \
--cc=kernelnewbies@lists.kernelnewbies.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).