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From: "Jan Beulich" <jbeulich@novell.com>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: <linux-kernel@vger.kernel.org>
Subject: x86: potential ioremap() issues
Date: Thu, 28 Feb 2008 12:59:19 +0000	[thread overview]
Message-ID: <47C6BE37.76E4.0078.0@novell.com> (raw)

Ingo,

with the new ioremap() implementation I see a couple of (potential)
issues:
- When ioremap_page_range() fails, remove_vm_area() is used rather
  than vunmap() - I think this will cause a 'struct vm_struct' leak.
- While ioremap() continues to happily map RAM pages (with a bogus
  [see below] WARN_ON_ONCE()), cacheability of the memory is not
  being restored in iounmap().
- The check for RAM pages (except for the WARN_ON_ONCE())
  continues to be applied only to lowmem pages.
- The WARN_ON_ONCE() itself is applied to the pfn after the
  preceding loop finished, i.e. to a pfn that doesn't actually participate
  in the operation. Shouldn't it be moved inside the loop?

Thanks for any clarification,
Jan


             reply	other threads:[~2008-02-28 12:59 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28 12:59 Jan Beulich [this message]
2008-02-28 13:24 ` x86: potential ioremap() issues Ingo Molnar
2008-02-28 14:30   ` Jan Beulich
2008-02-29 22:04   ` Oliver Pinter
2008-03-03 10:44     ` Ingo Molnar
2008-03-03 15:19       ` Oliver Pinter

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