From: David S. Miller <davem@davemloft.net>
Date: Mon, 29 Mar 2010 20:08:52 +0000 (-0700)
Subject: sparc64: Properly truncate pt_regs framepointer in perf callback.
X-Git-Tag: v2.6.34-rc3~10^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e8307ecaf9f8c8b5b3b22145021204c4e73114a;p=pandora-kernel.git

sparc64: Properly truncate pt_regs framepointer in perf callback.

For 32-bit processes, we save the full 64-bits of the regs in pt_regs.

But unlike when the userspace actually does load and store
instructions, the top 32-bits don't get automatically truncated by the
cpu in kernel mode (because the kernel doesn't execute with PSTATE_AM
address masking enabled).

So we have to do it by hand.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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