patches/cherry/b83b82f9f431f20ae35cb3b11443049e31a71481.patch

From b83b82f9f431f20ae35cb3b11443049e31a71481 Mon Sep 17 00:00:00 2001
From: Yi Kong <yikong@google.com>
Date: Tue, 28 Jun 2022 15:29:38 +0800
Subject: [PATCH] [lldb] Fix build on older Linux kernel versions

PERF_COUNT_SW_DUMMY is introduced in Linux 3.12.

Differential Revision: https://reviews.llvm.org/D128707
---
 lldb/source/Plugins/Process/Linux/Perf.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lldb/source/Plugins/Process/Linux/Perf.cpp b/lldb/source/Plugins/Process/Linux/Perf.cpp
index ed65c61dc48..267d2e96dec 100644
--- a/lldb/source/Plugins/Process/Linux/Perf.cpp
+++ b/lldb/source/Plugins/Process/Linux/Perf.cpp
@@ -11,6 +11,7 @@
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MathExtras.h"
 
+#include <linux/version.h>
 #include <sys/mman.h>
 #include <sys/syscall.h>
 #include <unistd.h>
@@ -21,6 +22,7 @@ using namespace llvm;
 
 Expected<LinuxPerfZeroTscConversion>
 lldb_private::process_linux::LoadPerfTscConversionParameters() {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
   lldb::pid_t pid = getpid();
   perf_event_attr attr;
   memset(&attr, 0, sizeof(attr));
@@ -48,6 +50,10 @@ lldb_private::process_linux::LoadPerfTscConversionParameters() {
                       err_cap);
     return llvm::createStringError(llvm::inconvertibleErrorCode(), err_msg);
   }
+#else
+  std::string err_msg = "PERF_COUNT_SW_DUMMY requires Linux 3.12";
+  return llvm::createStringError(llvm::inconvertibleErrorCode(), err_msg);
+#endif
 }
 
 void resource_handle::MmapDeleter::operator()(void *ptr) {
-- 
2.37.0.rc0.161.g10f37bed90-goog