From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>
Subject: [PATCH 4.4 12/18] powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8
Date: Mon, 4 May 2020 19:57:10 +0200 [thread overview]
Message-ID: <20200504165444.020859784@linuxfoundation.org> (raw)
In-Reply-To: <20200504165441.533160703@linuxfoundation.org>
From: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
commit 370f06c88528b3988fe24a372c10e1303bb94cf6 upstream.
Commit 7a7868326d77 ("powerpc/perf: Add an explict flag indicating
presence of SLOT field") introduced the PPMU_HAS_SSLOT flag to remove
the assumption that MMCRA[SLOT] was present when PPMU_ALT_SIPR was not
set.
That commit's changelog also mentions that Power8 does not support
MMCRA[SLOT]. However when the Power8 PMU support was merged, it
errnoeously included the PPMU_HAS_SSLOT flag.
So remove PPMU_HAS_SSLOT from the Power8 flags.
mpe: On systems where MMCRA[SLOT] exists, the field occupies bits 37:39
(IBM numbering). On Power8 bit 37 is reserved, and 38:39 overlap with
the high bits of the Threshold Event Counter Mantissa. I am not aware of
any published events which use the threshold counting mechanism, which
would cause the mantissa bits to be set. So in practice this bug is
unlikely to trigger.
Fixes: e05b9b9e5c10 ("powerpc/perf: Power8 PMU support")
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/powerpc/perf/power8-pmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -816,7 +816,7 @@ static struct power_pmu power8_pmu = {
.get_constraint = power8_get_constraint,
.get_alternatives = power8_get_alternatives,
.disable_pmc = power8_disable_pmc,
- .flags = PPMU_HAS_SSLOT | PPMU_HAS_SIER | PPMU_ARCH_207S,
+ .flags = PPMU_HAS_SIER | PPMU_ARCH_207S,
.n_generic = ARRAY_SIZE(power8_generic_events),
.generic_events = power8_generic_events,
.cache_events = &power8_cache_events,
next prev parent reply other threads:[~2020-05-04 18:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-04 17:56 [PATCH 4.4 00/18] 4.4.222-rc1 review Greg Kroah-Hartman
2020-05-04 17:56 ` [PATCH 4.4 01/18] ext4: fix special inode number checks in __ext4_iget() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 02/18] drm/qxl: qxl_release leak in qxl_hw_surface_alloc() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 03/18] ALSA: pcm: oss: Place the plugin buffer overflow checks correctly Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 04/18] PM: ACPI: Output correct message on target power state Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 05/18] RDMA/mlx4: Initialize ib_spec on the stack Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 06/18] vfio/type1: Fix VA->PA translation for PFNMAP VMAs in vaddr_get_pfn() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 07/18] ALSA: opti9xx: shut up gcc-10 range warning Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 08/18] nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 09/18] dmaengine: dmatest: Fix iteration non-stop logic Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 10/18] i2c: designware-pci: use IRQF_COND_SUSPEND flag Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 11/18] perf hists: Fix HISTC_MEM_DCACHELINE width setting Greg Kroah-Hartman
2020-05-04 17:57 ` Greg Kroah-Hartman [this message]
2020-05-04 17:57 ` [PATCH 4.4 13/18] perf/x86: Fix uninitialized value usage Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 14/18] [media] exynos4-is: fix a format string bug Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 15/18] ASoC: wm8960: Fix WM8960_SYSCLK_PLL mode Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 16/18] ASoC: imx-spdif: Fix crash on suspend Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 17/18] ipv6: use READ_ONCE() for inet->hdrincl as in ipv4 Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 4.4 18/18] selinux: properly handle multiple messages in selinux_netlink_send() Greg Kroah-Hartman
2020-05-05 7:43 ` [PATCH 4.4 00/18] 4.4.222-rc1 review Chris Paterson
2020-05-05 8:36 ` Jon Hunter
2020-05-05 15:41 ` Guenter Roeck
2020-05-05 15:50 ` Naresh Kamboju
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