Date: Mon, 05 Feb 1996 01:05:41 +0900 From: KATO Takenori <kato@eclogite.eps.nagoya-u.ac.jp> To: current@freebsd.org Subject: kmem_malloc called at splimp Message-ID: <199602041605.BAA00550@marble.eps.nagoya-u.ac.jp>
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The function kmem_malloc() is called at splimp when mbuffer is
initialized. Is it safe?
1. The function mbinit() calls m_clalloc() at splimp.
2. The function m_clalloc() calls kmem_malloc() without changing
software interruption mask.
3. Therefore, kmem_malloc() is called at splimp.
4. The comment of kmem_malloc says that `this still only works in a
uni-processor environment and when called at splhigh().'
^^^^^^^^^^^^^^^^^^^^^^^^
Because splimp of FreeBSD doesn't block disk I/O, above operation may
clobber vm map IF disk I/O interruption occurs. (I have not checked
whether it occurs or not, yet.)
----
KATO Takenori <kato@eclogite.eps.nagoya-u.ac.jp>
Dept. Earth Planet. Sci., Nagoya Univ., Nagoya 464-01
Voice: +81-52-789-2529 Fax: +81-52-789-3033
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