From: Andi Kleen <ak@suse.de>
To: linux-arch@vger.kernel.org
Subject: You might need vmalloc_sync_all()
Date: Tue, 1 May 2007 06:26:55 +0200 [thread overview]
Message-ID: <20070501042655.GL25929@bingen.suse.de> (raw)
Since someone mentioned again.
Right now only x86 implements vmalloc_sync_all(). But iff:
- Your module mappings might require a page fault calling C
code in kernel
- You got a pagefault notifier at the beginning of the page fault
handler
you risk a endless pagefault recursion with modular pagefault
notifiers. vmalloc_sync_all should sync all the available mappings
on notifier register so that the C pf handler is not called for module
faults.
Apparently at least ARM has this problem.
If the kernel module fault is only assembler code without notifier
(e.g. to reload a TLB) it is probably not needed.
-Andi
next reply other threads:[~2007-05-01 3:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-01 4:26 Andi Kleen [this message]
2007-05-01 7:44 ` You might need vmalloc_sync_all() Russell King
2007-05-01 11:37 ` Andi Kleen
2007-05-01 19:20 ` Russell King
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