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devel/llvm17: openmp Fix child processes affinity

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Backport upstream 73bb8d9d92f6:
    [OpenMP] Fix child processes to use affinity_none (#91391)

PR:		278843
Submitted by:	cbl@cbl.us
This commit is contained in:
Brooks Davis 2024-05-10 18:20:47 +01:00
parent eb97db5c50
commit fdb8b5148c
2 changed files with 41 additions and 1 deletions
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2
devel/llvm17/Makefile
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@ -1,6 +1,6 @@
PORTNAME= llvm
DISTVERSION= 17.0.6
PORTREVISION= 5
PORTREVISION= 6
CATEGORIES= devel lang
MASTER_SITES= https://github.com/llvm/llvm-project/releases/download/llvmorg-${DISTVERSION:S/rc/-rc/}/ \
https://${PRE_}releases.llvm.org/${LLVM_RELEASE}${RCDIR}/

40
devel/llvm17/files/patch-backport-73bb8d9d92f6 Normal file
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@ -0,0 +1,40 @@
commit 73bb8d9d92f689863c94d48517e89d35dae0ebcf
Author: Jonathan Peyton <jonathan.l.peyton@intel.com>
Date: Wed May 8 09:23:50 2024 -0500
[OpenMP] Fix child processes to use affinity_none (#91391)
When a child process is forked with OpenMP already initialized, the
child process resets its affinity mask and sets proc-bind-var to false
so that the entire original affinity mask is used. This patch corrects
an issue with the affinity initialization code setting affinity to
compact instead of none for this special case of forked children.
The test trying to catch this only testing explicit setting of
KMP_AFFINITY=none. Add test run for no KMP_AFFINITY setting.
Fixes: #91098
diff --git openmp/runtime/src/kmp_settings.cpp openmp/runtime/src/kmp_settings.cpp
index b9c8289b5c51..8b6092cb1085 100644
--- openmp/runtime/src/kmp_settings.cpp
+++ openmp/runtime/src/kmp_settings.cpp
@@ -6420,6 +6420,8 @@ void __kmp_env_initialize(char const *string) {
}
if ((__kmp_nested_proc_bind.bind_types[0] != proc_bind_intel) &&
(__kmp_nested_proc_bind.bind_types[0] != proc_bind_default)) {
+ if (__kmp_nested_proc_bind.bind_types[0] == proc_bind_false)
+ __kmp_affinity.type = affinity_none;
if (__kmp_affinity.type == affinity_default) {
__kmp_affinity.type = affinity_compact;
__kmp_affinity.flags.dups = FALSE;
diff --git openmp/runtime/test/affinity/redetect.c openmp/runtime/test/affinity/redetect.c
index dba83b72cc42..4b96d1bd92ee 100644
--- openmp/runtime/test/affinity/redetect.c
+++ openmp/runtime/test/affinity/redetect.c
@@ -1,4 +1,5 @@
// RUN: %libomp-compile
+// RUN: %libomp-run
// RUN: env KMP_AFFINITY=none %libomp-run
// REQUIRES: linux