tree d0361a2e093120880adecbd87c1f0f26a57541e9
parent d2566af8c4860a03ca685ef0910de406679c3e4e
author David S. Miller <davem@davemloft.net> 1269893332 -0700
committer David S. Miller <davem@davemloft.net> 1269893332 -0700

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>