From: Andrew Morton <akpm@linux-foundation.org>
Date: Sun, 3 Jun 2007 20:50:41 +0000 (-0700)
Subject: vanishing ioctl handler debugging
X-Git-Tag: v2.6.22-rc4~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78ae87c3cd723c8a8dcd67d4e4cbc6d63671c108;p=pandora-kernel.git

vanishing ioctl handler debugging

We've had several reoprts of the CPU jumping to 0x00000000 is do_ioctl().  I
assume that there's a race and someone is zeroing out the ioctl handler while
this CPU waits for the lock_kernel().

The patch adds code to detect this, then emits stuff which will hopefuly lead
us to the culprit.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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