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| author | Michael Ellerman <mpe@ellerman.id.au> | 2014-07-23 11:20:04 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-07-23 11:16:47 +0400 |
| commit | 8903461c9bc56fcb041fb92d054e2529951770b6 (patch) | |
| tree | 56c803836b9612a4e0cf25471df04621a4307cbd /kernel/kmod.c | |
| parent | 6f5405bc2ee0102bb3856e2cdea64ff415db2e0c (diff) | |
| download | linux-8903461c9bc56fcb041fb92d054e2529951770b6.tar.xz | |
powerpc/perf: Fix MMCR2 handling for EBB
In the recent commit b50a6c584bb4 "Clear MMCR2 when enabling PMU", I
screwed up the handling of MMCR2 for tasks using EBB.
We must make sure we set MMCR2 *before* ebb_switch_in(), otherwise we
overwrite the value of MMCR2 that userspace may have written. That
potentially breaks a task that uses EBB and manually uses MMCR2 for
event freezing.
Fixes: b50a6c584bb4 ("powerpc/perf: Clear MMCR2 when enabling PMU")
Cc: stable@vger.kernel.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'kernel/kmod.c')
0 files changed, 0 insertions, 0 deletions