From: Yoav Etsion <etsman@cs.huji.ac.il>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Tsafrir Dan <dants@cs.huji.ac.il>
Subject: [BUG] bug in mmap_kmem
Date: Tue, 19 Jun 2001 13:34:25 +0300 (IDT) [thread overview]
Message-ID: <Pine.LNX.4.20_heb2.08.0106191305060.1005-100000@pomela2.cs.huji.ac.il> (raw)
Hi,
The problem is that mmaping a segment <addr,len> from /dev/kmem gives
differnet results than reading the same <addr,len>.
It seems that the bug is that mmap_kmem is a macro for mmap_mem (for
/dev/mem).
mmap_mem maps a _physical_ offset into a vm area vma, while mmap_kmem
should map a _virtual_ offset into a vm area.
I hacked it to work by copying mmap_mem to mmap_kmem and adding __pa() in
the proper assginment, but I don't know how to check if the offset is
valid in the kernel virtual memory. Maybe someone who knows the mm code
better can fix this?
Thanks,
Yoav Etsion
next reply other threads:[~2001-06-19 10:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-19 10:34 Yoav Etsion [this message]
2001-06-19 11:00 ` Scsi Dead2
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