From: Paul Mundt <lethal@linux-sh.org>
To: linux-kernel@vger.kernel.org
Subject: fixmap TLB flushing clarification
Date: Sat, 20 Mar 2004 19:06:19 -0500 [thread overview]
Message-ID: <20040321000619.GB14843@linux-sh.org> (raw)
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In include/asm-*/fixmap.h the comment about fixed_addresses states:
...
* these 'compile-time allocated' memory buffers are
* fixed-size 4k pages. (or larger if used with an increment
* highger than 1) use fixmap_set(idx,phys) to associate
* physical memory with fixmap indices.
*
* TLB entries of such buffers will not be flushed across
* task switches.
...
I'm curious about the last statement, is this to mean that a TLB entry will
be reserved at set_fixmap() time in which the translation will happen, and
that particular entry will be locked down for the duration of the mapping?
Is some other convention in place to preserve the translation across a
TLB flush at context switch time, or do we actually need to give up a
TLB entry for each fixmap?
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next reply other threads:[~2004-03-21 0:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-21 0:06 Paul Mundt [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-03-21 10:30 fixmap TLB flushing clarification Manfred Spraul
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