From: Mark Hapke <mah@tzi.de>
To: linux-smp@vger.kernel.org
Subject: get/put_user() problems
Date: Thu, 30 May 2002 02:47:06 +0200 [thread overview]
Message-ID: <3CF5768A.6080308@tzi.de> (raw)
Hello,
i need to copy data from kernel space to user space. An ISR executed on
CPU0 needs to perform get/put_user()-calls to transfer some data into
user space, where the concerned process is executed on CPU1.
It is obvious that i must set up something before, because it doesn't
work the usual way, put_user() returns -14 (-EFAULT) when called.
BTW, it works when both, ISR and process, are executed on the same CPU.
My system is a dual P3 at 933 Mhz and 1G of ram. Kernel version is
2.4.9. It is compatible to Intel MP-Spec. 1.1. The chipset is
ServerWorks CNB20LE (rev 05).
Does anyone have an idea?
Thank you,
Mark
next reply other threads:[~2002-05-30 0:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-30 0:47 Mark Hapke [this message]
2002-05-30 2:21 ` get/put_user() problems Alan Cox
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