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Subject[PATCH v2 3/4] gcov: clang: link/unlink profiling data set.
Date
From: Nick Desaulniers <ndesaulniers@google.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@google.com>
Signed-off-by: Tri Vo <trong@android.com>
Tested-by: Trilok Soni <tsoni@quicinc.com>
Tested-by: Prasad Sodagudi <psodagud@quicinc.com>
Tested-by: Tri Vo <trong@android.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
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