From: Michael Ellerman <mpe@ellerman.id.au>
Date: Tue, 17 Jun 2014 06:15:33 +0000 (+1000)
Subject: powerpc/ftrace: Fix typo in mask of opcode
X-Git-Tag: omap-for-v3.17/soc-cleanup~50^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfc382a19a2478768ef09d1c745b116e4fca9b4e;p=pandora-kernel.git

powerpc/ftrace: Fix typo in mask of opcode

In commit 24a1bdc35, "Fix ABIv2 issues with __ftrace_make_call", Anton
changed the logic that checks for the expected code sequence when
patching a module.

We missed the typo in the mask, 0xffff00000 should be 0xffff0000, which
has the effect of making the test always true.

That makes it impossible to ftrace against modules, eg:

  Unexpected call sequence: 48000008 e8410018
  WARNING: at ../kernel/trace/ftrace.c:1638
  ftrace failed to modify [<d000000007cf001c>] rng_dev_open+0x1c/0x70 [rng_core]

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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