[PATCH 7.2.y 1/2] tracing/probes: ignore id update from btf_type_skip_modifiers

[Sasha Levin <sashal@kernel.org>]

From: Martin Kaiser <martin@kaiser.cx>

[ Upstream commit 823b37855829bc328d46102a56e4d0b2f7a3d0d1 ]

We can pass NULL as id pointer to btf_type_skip_modifiers if we do not
need the id of the returned btf_type.

Link: https://lore.kernel.org/all/20260623132937.3494895-1-martin@kaiser.cx/

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Stable-dep-of: 47e93045a2db ("tracing/probes: Fix BTF kflag check for anonymous struct member access")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 kernel/trace/trace_probe.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index c8fd9b946f442..2d58cf99b6f70 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -356,9 +356,8 @@ static bool btf_type_is_char_ptr(struct btf *btf, const struct btf_type *type)
 {
 	const struct btf_type *real_type;
 	u32 intdata;
-	s32 tid;
 
-	real_type = btf_type_skip_modifiers(btf, type->type, &tid);
+	real_type = btf_type_skip_modifiers(btf, type->type, NULL);
 	if (!real_type)
 		return false;
 
@@ -375,14 +374,13 @@ static bool btf_type_is_char_array(struct btf *btf, const struct btf_type *type)
 	const struct btf_type *real_type;
 	const struct btf_array *array;
 	u32 intdata;
-	s32 tid;
 
 	if (BTF_INFO_KIND(type->info) != BTF_KIND_ARRAY)
 		return false;
 
 	array = (const struct btf_array *)(type + 1);
 
-	real_type = btf_type_skip_modifiers(btf, array->type, &tid);
+	real_type = btf_type_skip_modifiers(btf, array->type, NULL);
 
 	intdata = btf_type_int(real_type);
 	return !(BTF_INT_ENCODING(intdata) & BTF_INT_SIGNED)
@@ -585,7 +583,6 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
 	struct btf *btf = ctx_btf(ctx);
 	char *next;
 	int is_ptr;
-	s32 tid;
 
 	do {
 		if (!is_struct) {
@@ -596,7 +593,7 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
 			}
 
 			/* Convert a struct pointer type to a struct type */
-			type = btf_type_skip_modifiers(btf, type->type, &tid);
+			type = btf_type_skip_modifiers(btf, type->type, NULL);
 			if (!type) {
 				trace_probe_log_err(ctx->offset, BAD_BTF_TID);
 				return -EINVAL;
@@ -636,7 +633,7 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
 				ctx->last_bitsize = 0;
 			}
 
-			type = btf_type_skip_modifiers(btf, field->type, &tid);
+			type = btf_type_skip_modifiers(btf, field->type, NULL);
 			if (!type) {
 				trace_probe_log_err(ctx->offset, BAD_BTF_TID);
 				return -EINVAL;
@@ -755,7 +752,7 @@ static int parse_btf_arg(char *varname,
 	return -ENOENT;
 
 found:
-	type = btf_type_skip_modifiers(ctx->btf, tid, &tid);
+	type = btf_type_skip_modifiers(ctx->btf, tid, NULL);
 found_type:
 	if (!type) {
 		trace_probe_log_err(ctx->offset, BAD_BTF_TID);
-- 
2.53.0