path: root/arch
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authorMichael Ellerman <michael@ellerman.id.au>2013-06-05 18:03:36 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-10 08:36:35 +1000
commitb11ae95100f7061b39a15e5c1ecbf862464ac4b4 (patch)
tree93f11462e58eb8d31c58712a6eba5f9de6a62c29 /arch
parent6772faa1ba22eba18d087c2459030a683b65be57 (diff)
powerpc: Partial revert of "Context switch more PMU related SPRs"
In commit 59affcd I added context switching of more PMU SPRs, because they are potentially exposed to userspace on Power8. However despite me being a smart arse in the commit message it's actually not correct. In particular it interacts badly with a global perf record. We will have to do something more complicated, but that will have to wait for 3.11. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
1 files changed, 0 insertions, 28 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 246b11c4fe7e..8741c854e03d 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -465,20 +465,6 @@ BEGIN_FTR_SECTION
std r0, THREAD_EBBHR(r3)
mfspr r0, SPRN_EBBRR
std r0, THREAD_EBBRR(r3)
- /* PMU registers made user read/(write) by EBB */
- mfspr r0, SPRN_SIAR
- std r0, THREAD_SIAR(r3)
- mfspr r0, SPRN_SDAR
- std r0, THREAD_SDAR(r3)
- mfspr r0, SPRN_SIER
- std r0, THREAD_SIER(r3)
- mfspr r0, SPRN_MMCR0
- std r0, THREAD_MMCR0(r3)
- mfspr r0, SPRN_MMCR2
- std r0, THREAD_MMCR2(r3)
- mfspr r0, SPRN_MMCRA
- std r0, THREAD_MMCRA(r3)
@@ -581,20 +567,6 @@ BEGIN_FTR_SECTION
ld r0, THREAD_EBBRR(r4)
mtspr SPRN_EBBRR, r0
- /* PMU registers made user read/(write) by EBB */
- ld r0, THREAD_SIAR(r4)
- mtspr SPRN_SIAR, r0
- ld r0, THREAD_SDAR(r4)
- mtspr SPRN_SDAR, r0
- ld r0, THREAD_SIER(r4)
- mtspr SPRN_SIER, r0
- ld r0, THREAD_MMCR0(r4)
- mtspr SPRN_MMCR0, r0
- ld r0, THREAD_MMCR2(r4)
- mtspr SPRN_MMCR2, r0
- ld r0, THREAD_MMCRA(r4)
- mtspr SPRN_MMCRA, r0
ld r0,THREAD_TAR(r4)
mtspr SPRN_TAR,r0

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