From: Dan Malek <dan@embeddededge.com>
To: joakim.tjernlund@lumentis.se
Cc: "Linuxppc-Embedded@Lists. Linuxppc. Org"
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: GUARDED attribute not set by consistent_alloc()
Date: Fri, 07 Feb 2003 10:57:03 -0500 [thread overview]
Message-ID: <3E43D74F.9000208@embeddededge.com> (raw)
In-Reply-To: IGEFJKJNHJDCBKALBJLLKEANFKAA.joakim.tjernlund@lumentis.se
Joakim Tjernlund wrote:
> ioremap() adds _PAGE_GUARDED if _PAGE_NO_CACHE is set. Should not
> consistent_alloc() also add _PAGE_GUARDED?
No. ioremap() is used to map device registers, where operation
order is important. consistent_alloc() maps real memory, where
setting guarded wouldn't change any behavior and would cost
significant pipeline drain cycles.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2003-02-07 15:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-07 15:07 GUARDED attribute not set by consistent_alloc() Joakim Tjernlund
2003-02-07 15:57 ` Dan Malek [this message]
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