linux-4.16.7-openpower2
Add one patch to work around an IMC crash with a socket
guarded out.
Patch not yet upstream, but heading there:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/openpower/linux/0002-powerpc-perf-Fix-memory-allocation-for-core-imc-base.patch b/openpower/linux/0002-powerpc-perf-Fix-memory-allocation-for-core-imc-base.patch
new file mode 100644
index 0000000..ce6ca50
--- /dev/null
+++ b/openpower/linux/0002-powerpc-perf-Fix-memory-allocation-for-core-imc-base.patch
@@ -0,0 +1,55 @@
+From 65c085a4b6b757778f2ebb1f596a6091d1d96bc8 Mon Sep 17 00:00:00 2001
+From: Anju T Sudhakar <anju@linux.vnet.ibm.com>
+Date: Fri, 11 May 2018 19:13:42 +0530
+Subject: [PATCH] powerpc/perf: Fix memory allocation for core-imc based on
+ num_possible_cpus()
+
+Currently memory is allocated for core-imc based on cpu_present_mask, which has
+bit 'cpu' set iff cpu is populated. We use (cpu number / threads per core)
+as as array index to access the memory.
+So in a system with guarded cores, since allocation happens based on
+cpu_present_mask, (cpu number / threads per core) bounds the index and leads
+to memory overflow.
+
+The issue is exposed in a guard test.
+The guard test will make some CPU's as un-available to the system during boot
+time as well as at runtime. So when the cpu is unavailable to the system during
+boot time, the memory allocation happens depending on the number of available
+cpus. And when we access the memory using (cpu number / threads per core) as the
+index the system crashes due to memory overflow.
+
+Allocating memory for core-imc based on cpu_possible_mask, which has
+bit 'cpu' set iff cpu is populatable, will fix this issue.
+
+Reported-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
+Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
+Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
+---
+ arch/powerpc/perf/imc-pmu.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
+index d7532e7b9ab5..75fb23c24ee8 100644
+--- a/arch/powerpc/perf/imc-pmu.c
++++ b/arch/powerpc/perf/imc-pmu.c
+@@ -1146,7 +1146,7 @@ static int init_nest_pmu_ref(void)
+
+ static void cleanup_all_core_imc_memory(void)
+ {
+- int i, nr_cores = DIV_ROUND_UP(num_present_cpus(), threads_per_core);
++ int i, nr_cores = DIV_ROUND_UP(num_possible_cpus(), threads_per_core);
+ struct imc_mem_info *ptr = core_imc_pmu->mem_info;
+ int size = core_imc_pmu->counter_mem_size;
+
+@@ -1264,7 +1264,7 @@ static int imc_mem_init(struct imc_pmu *pmu_ptr, struct device_node *parent,
+ if (!pmu_ptr->pmu.name)
+ return -ENOMEM;
+
+- nr_cores = DIV_ROUND_UP(num_present_cpus(), threads_per_core);
++ nr_cores = DIV_ROUND_UP(num_possible_cpus(), threads_per_core);
+ pmu_ptr->mem_info = kcalloc(nr_cores, sizeof(struct imc_mem_info),
+ GFP_KERNEL);
+
+--
+2.14.3
+
diff --git a/openpower/linux/0002-Release-OpenPower-kernel.patch b/openpower/linux/0003-Release-OpenPower-kernel.patch
similarity index 63%
rename from openpower/linux/0002-Release-OpenPower-kernel.patch
rename to openpower/linux/0003-Release-OpenPower-kernel.patch
index 11e144e..598d6b4 100644
--- a/openpower/linux/0002-Release-OpenPower-kernel.patch
+++ b/openpower/linux/0003-Release-OpenPower-kernel.patch
@@ -1,9 +1,9 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Joel Stanley <joel@jms.id.au>
-Date: Thu, 3 May 2018 12:21:12 +0930
-Subject: [PATCH 2/2] Release OpenPower kernel
+From: Stewart Smith <stewart@linux.ibm.com>
+Date: Fri, 11 May 2018 17:41:12 -0700
+Subject: [PATCH 3/3] Release OpenPower kernel
-Signed-off-by: Joel Stanley <joel@jms.id.au>
+Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
---
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
@@ -17,7 +17,7 @@
PATCHLEVEL = 16
SUBLEVEL = 7
-EXTRAVERSION =
-+EXTRAVERSION = -openpower1
++EXTRAVERSION = -openpower2
NAME = Fearless Coyote
# *DOCUMENTATION*