linux-kernel - [PATCH 3/4] gcov: clang: link/unlink profiling data set.

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Date:   Mon, 14 Jan 2019 13:04:25 -0800
From:   Tri Vo <trong@...roid.com>
To:     oberpar@...ux.ibm.com
Cc:     ghackmann@...roid.com, ndesaulniers@...gle.com,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Tri Vo <trong@...roid.com>, Trilok Soni <tsoni@...cinc.com>,
        Prasad Sodagudi <psodagud@...cinc.com>
Subject: [PATCH 3/4] gcov: clang: link/unlink profiling data set.

From: Nick Desaulniers <ndesaulniers@...gle.com>

gcov.h defines an interface to access gcov_info data.

Add Clang implementation of gcov_info_link/gcov_info_unlink interfaces.

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Tri Vo <trong@...roid.com>
Tested-by: Trilok Soni <tsoni@...cinc.com>
Tested-by: Prasad Sodagudi <psodagud@...cinc.com>
Tested-by: Tri Vo <trong@...roid.com>
---
 kernel/gcov/clang.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/kernel/gcov/clang.c b/kernel/gcov/clang.c
index b00795d28137..ea42deb852f7 100644
--- a/kernel/gcov/clang.c
+++ b/kernel/gcov/clang.c
@@ -77,6 +77,7 @@ struct gcov_fn_info {
 
 	u32 num_counters;
 	u64 *counters;
+	const char *function_name;
 };
 
 static struct gcov_info *current_info;
@@ -124,7 +125,7 @@ void llvm_gcda_emit_function(u32 ident, const char *function_name,
 
 	if (!info) {
 		pr_warn_ratelimited("failed to allocate gcov function info for %s\n",
-				function_name);
+				function_name ?: "UNKNOWN");
 		return;
 	}
 
@@ -133,6 +134,8 @@ void llvm_gcda_emit_function(u32 ident, const char *function_name,
 	info->checksum = func_checksum;
 	info->use_extra_checksum = use_extra_checksum;
 	info->cfg_checksum = cfg_checksum;
+	if (function_name)
+		info->function_name = kstrdup(function_name, GFP_KERNEL);
 
 	list_add_tail(&info->head, &current_info->functions);
 }
@@ -193,6 +196,26 @@ struct gcov_info *gcov_info_next(struct gcov_info *info)
 	return list_next_entry(info, head);
 }
 
+/**
+ * gcov_info_link - link/add profiling data set to the list
+ * @info: profiling data set
+ */
+void gcov_info_link(struct gcov_info *info)
+{
+	list_add_tail(&info->head, &clang_gcov_list);
+}
+
+/**
+ * gcov_info_unlink - unlink/remove profiling data set from the list
+ * @prev: previous profiling data set
+ * @info: profiling data set
+ */
+void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
+{
+	if (prev)
+		list_del(&prev->head);
+}
+
 /* Symbolic links to be created for each profiling data file. */
 const struct gcov_link gcov_link[] = {
 	{ OBJ_TREE, "gcno" },	/* Link to .gcno file in $(objtree). */
@@ -256,8 +279,8 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
 		return NULL;
 	INIT_LIST_HEAD(&fn_dup->head);
 
-	fn_dup->name = kstrdup(fn->name, GFP_KERNEL);
-	if (!fn_dup->name)
+	fn_dup->function_name = kstrdup(fn->function_name, GFP_KERNEL);
+	if (!fn_dup->function_name)
 		goto err_name;
 
 	fn_dup->counters = kmemdup(fn->counters,
@@ -269,7 +292,7 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
 	return fn_dup;
 
 err_counters:
-	kfree(fn_dup->name);
+	kfree(fn_dup->function_name);
 err_name:
 	kfree(fn_dup);
 	return NULL;
@@ -317,7 +340,7 @@ void gcov_info_free(struct gcov_info *info)
 	struct gcov_fn_info *fn, *tmp;
 
 	list_for_each_entry_safe(fn, tmp, &info->functions, head) {
-		kfree(fn->name);
+		kfree(fn->function_name);
 		kfree(fn->counters);
 		list_del(&fn->head);
 		kfree(fn);
-- 
2.20.1.97.g81188d93c3-goog