[PATCH bpf v1 2/4] selftests/bpf: Revert "selftests/bpf: Add tests for raw_tp null handling"

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

This patch reverts
commit d798ce3f4cab ("selftests/bpf: Add tests for raw_tp null handling")
since it's parent
commit cb4158ce8ec8 ("bpf: Mark raw_tp arguments with PTR_MAYBE_NULL")
is also being reverted.

Fixes: d798ce3f4cab ("selftests/bpf: Add tests for raw_tp null handling")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 .../bpf/bpf_testmod/bpf_testmod-events.h      |  8 -----
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   |  2 --
 .../selftests/bpf/prog_tests/raw_tp_null.c    | 25 ---------------
 .../testing/selftests/bpf/progs/raw_tp_null.c | 32 -------------------
 4 files changed, 67 deletions(-)
 delete mode 100644 tools/testing/selftests/bpf/prog_tests/raw_tp_null.c
 delete mode 100644 tools/testing/selftests/bpf/progs/raw_tp_null.c

diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
index aeef86b3da74..6c3b4d4f173a 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
@@ -40,14 +40,6 @@ DECLARE_TRACE(bpf_testmod_test_nullable_bare,
 	TP_ARGS(ctx__nullable)
 );
 
-struct sk_buff;
-
-DECLARE_TRACE(bpf_testmod_test_raw_tp_null,
-	TP_PROTO(struct sk_buff *skb),
-	TP_ARGS(skb)
-);
-
-
 #undef BPF_TESTMOD_DECLARE_TRACE
 #ifdef DECLARE_TRACE_WRITABLE
 #define BPF_TESTMOD_DECLARE_TRACE(call, proto, args, size) \
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index cc9dde507aba..c64dd001a4ed 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -413,8 +413,6 @@ bpf_testmod_test_read(struct file *file, struct kobject *kobj,
 
 	(void)bpf_testmod_test_arg_ptr_to_struct(&struct_arg1_2);
 
-	(void)trace_bpf_testmod_test_raw_tp_null(NULL);
-
 	bpf_testmod_test_struct_ops3();
 
 	struct_arg3 = kmalloc((sizeof(struct bpf_testmod_struct_arg_3) +
diff --git a/tools/testing/selftests/bpf/prog_tests/raw_tp_null.c b/tools/testing/selftests/bpf/prog_tests/raw_tp_null.c
deleted file mode 100644
index 6fa19449297e..000000000000
--- a/tools/testing/selftests/bpf/prog_tests/raw_tp_null.c
+++ /dev/null
@@ -1,25 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
-
-#include <test_progs.h>
-#include "raw_tp_null.skel.h"
-
-void test_raw_tp_null(void)
-{
-	struct raw_tp_null *skel;
-
-	skel = raw_tp_null__open_and_load();
-	if (!ASSERT_OK_PTR(skel, "raw_tp_null__open_and_load"))
-		return;
-
-	skel->bss->tid = sys_gettid();
-
-	if (!ASSERT_OK(raw_tp_null__attach(skel), "raw_tp_null__attach"))
-		goto end;
-
-	ASSERT_OK(trigger_module_test_read(2), "trigger testmod read");
-	ASSERT_EQ(skel->bss->i, 3, "invocations");
-
-end:
-	raw_tp_null__destroy(skel);
-}
diff --git a/tools/testing/selftests/bpf/progs/raw_tp_null.c b/tools/testing/selftests/bpf/progs/raw_tp_null.c
deleted file mode 100644
index 457f34c151e3..000000000000
--- a/tools/testing/selftests/bpf/progs/raw_tp_null.c
+++ /dev/null
@@ -1,32 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
-
-#include <vmlinux.h>
-#include <bpf/bpf_tracing.h>
-
-char _license[] SEC("license") = "GPL";
-
-int tid;
-int i;
-
-SEC("tp_btf/bpf_testmod_test_raw_tp_null")
-int BPF_PROG(test_raw_tp_null, struct sk_buff *skb)
-{
-	struct task_struct *task = bpf_get_current_task_btf();
-
-	if (task->pid != tid)
-		return 0;
-
-	i = i + skb->mark + 1;
-	/* The compiler may move the NULL check before this deref, which causes
-	 * the load to fail as deref of scalar. Prevent that by using a barrier.
-	 */
-	barrier();
-	/* If dead code elimination kicks in, the increment below will
-	 * be removed. For raw_tp programs, we mark input arguments as
-	 * PTR_MAYBE_NULL, so branch prediction should never kick in.
-	 */
-	if (!skb)
-		i += 2;
-	return 0;
-}
-- 
2.43.5