From 9dc6d315ba350c9113f486ec897217a82838fb73 Mon Sep 17 00:00:00 2001
From: Xiong Zhou <xiongzhou4@huawei.com>
Date: Mon, 7 Aug 2023 14:44:56 +0800
Subject: [PATCH 1/2] [PGO kernel] Add fkernel-pgo option to support PGO kernel
 compilation.

---
 gcc/common.opt      | 4 ++++
 gcc/tree-profile.cc | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/common.opt b/gcc/common.opt
index e365a48bc..bd3b7dcb1 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2363,6 +2363,10 @@ fprofile-generate=
 Common Joined RejectNegative
 Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=.
 
+fkernel-pgo
+Common Var(flag_kernel_pgo) Optimization Init(0)
+Disable TLS setting of instrumentation variables to support PGO kernel compilation in -fprofile-generate, as kernel does not support TLS.
+
 fprofile-info-section
 Common RejectNegative
 Register the profile information in the .gcov_info section instead of using a constructor/destructor.
diff --git a/gcc/tree-profile.cc b/gcc/tree-profile.cc
index 6d40401f8..e7646f1a1 100644
--- a/gcc/tree-profile.cc
+++ b/gcc/tree-profile.cc
@@ -108,7 +108,9 @@ init_ic_make_global_vars (void)
   DECL_ARTIFICIAL (ic_tuple_var) = 1;
   DECL_INITIAL (ic_tuple_var) = NULL;
   DECL_EXTERNAL (ic_tuple_var) = 1;
-  if (targetm.have_tls)
+  /* Disable TLS setting when compiling kernel in -fprofile-generate,
+     as kernel does not support TLS. */
+  if (targetm.have_tls && !flag_kernel_pgo)
     set_decl_tls_model (ic_tuple_var, decl_default_tls_model (ic_tuple_var));
 }
 
-- 
2.33.0