[meta-oe][PATCH] mongodb: Fix aarch64 build with gcc12

[meta-oe][PATCH] mongodb: Fix aarch64 build with gcc12

[Khem Raj]

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 ...just-the-cache-alignment-assumptions.patch | 45 +++++++++++++++++++
 .../recipes-dbs/mongodb/mongodb_git.bb        |  1 +
 2 files changed, 46 insertions(+)
 create mode 100644 meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb/0001-server-Adjust-the-cache-alignment-assumptions.patch

diff --git a/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb/0001-server-Adjust-the-cache-alignment-assumptions.patch b/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb/0001-server-Adjust-the-cache-alignment-assumptions.patch
new file mode 100644
index 0000000000..4b2a397b16
--- /dev/null
+++ b/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb/0001-server-Adjust-the-cache-alignment-assumptions.patch
@@ -0,0 +1,45 @@
+From 5c9e0d0fc9188bab0ae09c9c33df01938b0c1b6c Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 14 Apr 2022 09:25:33 -0700
+Subject: [PATCH] server: Adjust the cache alignment assumptions
+
+aarch64 has 256 for hardware_destructive_interference_size and gcc 12
+has added a warning to complain about mismatches which results in
+static_assert failures
+
+In file included from src/mongo/s/commands/cluster_find_cmd.cpp:39:
+src/mongo/db/stats/counters.h:185:47: error: static assertion failed: cache line spill
+ 185 |     static_assert(sizeof(decltype(_together)) <= stdx::hardware_constructive_interference_size,
+     |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The structure need to ensure true sharing for both the elements
+so align it to hardware_constructive_interference_size instead
+
+Upstream-Status: Reported [https://jira.mongodb.org/browse/SERVER-65664]
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ src/mongo/db/stats/counters.h | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/mongo/db/stats/counters.h b/src/mongo/db/stats/counters.h
+index aa11c84c2f1..710d75a672f 100644
+--- a/src/mongo/db/stats/counters.h
++++ b/src/mongo/db/stats/counters.h
+@@ -178,10 +178,10 @@ private:
+     // These two counters are always incremented at the same time, so
+     // we place them on the same cache line.
+     struct Together {
+-        AtomicWord<long long> logicalBytesIn{0};
+-        AtomicWord<long long> requests{0};
++        alignas(std::hardware_constructive_interference_size) AtomicWord<long long> logicalBytesIn{0};
++        alignas(std::hardware_constructive_interference_size) AtomicWord<long long> requests{0};
+     };
+-    CacheAligned<Together> _together{};
++    Together _together{};
+     static_assert(sizeof(decltype(_together)) <= stdx::hardware_constructive_interference_size,
+                   "cache line spill");
+ 
+-- 
+2.35.2
+
diff --git a/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb_git.bb b/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb_git.bb
index 310a0aa38e..7ea728aad4 100644
--- a/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb_git.bb
+++ b/meta-oe/dynamic-layers/meta-python/recipes-dbs/mongodb/mongodb_git.bb
@@ -31,6 +31,7 @@ SRC_URI = "git://github.com/mongodb/mongo.git;branch=v4.4;protocol=https \
            file://ppc64_ARCH_BITS.patch \
            file://PTHREAD_STACK_MIN.patch \
            file://0001-add-explict-static_cast-size_t-to-maxMemoryUsageByte.patch \
+           file://0001-server-Adjust-the-cache-alignment-assumptions.patch \
            "
 SRC_URI:append:libc-musl ="\
            file://0001-Mark-one-of-strerror_r-implementation-glibc-specific.patch \
-- 
2.35.2