[OpenMP] Skip extra blank line when parsing /proc/cpuinfo on LoongArch64

This fixes the following test cases:

* affinity/kmp-affinity.c
* affinity/kmp-hw-subset.c
* affinity/omp-places.c

Differential Revision: https://reviews.llvm.org/D139802

1 files changed, 11 insertions, 0 deletions

diff --git a/openmp/runtime/src/kmp_affinity.cpp b/openmp/runtime/src/kmp_affinity.cpp
index 43bf794..fb3f0ed 100644
--- a/openmp/runtime/src/kmp_affinity.cpp
+++ b/openmp/runtime/src/kmp_affinity.cpp
@@ -2943,6 +2943,17 @@ static bool __kmp_affinity_create_cpuinfo_map(int *line,
       }
       (*line)++;
 
+#if KMP_ARCH_LOONGARCH64
+      // The parsing logic of /proc/cpuinfo in this function highly depends on
+      // the blank lines between each processor info block. But on LoongArch a
+      // blank line exists before the first processor info block (i.e. after the
+      // "system type" line). This blank line was added because the "system
+      // type" line is unrelated to any of the CPUs. We must skip this line so
+      // that the original logic works on LoongArch.
+      if (*buf == '\n' && *line == 2)
+        continue;
+#endif
+
       char s1[] = "processor";
       if (strncmp(buf, s1, sizeof(s1) - 1) == 0) {
         CHECK_LINE;