linux-kernel - [PATCH v2 bpf-next 1/3] objtool: Copy noreturns.h to include/linux

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Message-Id: <20250223062735.3341-2-laoar.shao@gmail.com>
Date: Sun, 23 Feb 2025 14:27:33 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	jpoimboe@...nel.org,
	peterz@...radead.org
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v2 bpf-next 1/3] objtool: Copy noreturns.h to include/linux

It will used by bpf to reject attaching fexit prog to functions
annotated with __noreturn.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 include/linux/noreturns.h               | 52 +++++++++++++++++++++++++
 tools/objtool/Documentation/objtool.txt |  3 +-
 tools/objtool/sync-check.sh             |  2 +
 3 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/noreturns.h

diff --git a/include/linux/noreturns.h b/include/linux/noreturns.h
new file mode 100644
index 000000000000..b2174894f9f7
--- /dev/null
+++ b/include/linux/noreturns.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * This is a (sorted!) list of all known __noreturn functions in the kernel.
+ * It's needed for objtool to properly reverse-engineer the control flow graph.
+ *
+ * Yes, this is unfortunate.  A better solution is in the works.
+ */
+NORETURN(__fortify_panic)
+NORETURN(__ia32_sys_exit)
+NORETURN(__ia32_sys_exit_group)
+NORETURN(__kunit_abort)
+NORETURN(__module_put_and_kthread_exit)
+NORETURN(__stack_chk_fail)
+NORETURN(__tdx_hypercall_failed)
+NORETURN(__ubsan_handle_builtin_unreachable)
+NORETURN(__x64_sys_exit)
+NORETURN(__x64_sys_exit_group)
+NORETURN(arch_cpu_idle_dead)
+NORETURN(bch2_trans_in_restart_error)
+NORETURN(bch2_trans_restart_error)
+NORETURN(bch2_trans_unlocked_error)
+NORETURN(cpu_bringup_and_idle)
+NORETURN(cpu_startup_entry)
+NORETURN(do_exit)
+NORETURN(do_group_exit)
+NORETURN(do_task_dead)
+NORETURN(ex_handler_msr_mce)
+NORETURN(hlt_play_dead)
+NORETURN(hv_ghcb_terminate)
+NORETURN(kthread_complete_and_exit)
+NORETURN(kthread_exit)
+NORETURN(kunit_try_catch_throw)
+NORETURN(machine_real_restart)
+NORETURN(make_task_dead)
+NORETURN(mpt_halt_firmware)
+NORETURN(nmi_panic_self_stop)
+NORETURN(panic)
+NORETURN(panic_smp_self_stop)
+NORETURN(rest_init)
+NORETURN(rewind_stack_and_make_dead)
+NORETURN(rust_begin_unwind)
+NORETURN(rust_helper_BUG)
+NORETURN(sev_es_terminate)
+NORETURN(snp_abort)
+NORETURN(start_kernel)
+NORETURN(stop_this_cpu)
+NORETURN(usercopy_abort)
+NORETURN(x86_64_start_kernel)
+NORETURN(x86_64_start_reservations)
+NORETURN(xen_cpu_bringup_again)
+NORETURN(xen_start_kernel)
diff --git a/tools/objtool/Documentation/objtool.txt b/tools/objtool/Documentation/objtool.txt
index 7c3ee959b63c..70a878e4dc36 100644
--- a/tools/objtool/Documentation/objtool.txt
+++ b/tools/objtool/Documentation/objtool.txt
@@ -326,7 +326,8 @@ the objtool maintainers.
 
    The call from foo() to bar() doesn't return, but bar() is missing the
    __noreturn annotation.  NOTE: In addition to annotating the function
-   with __noreturn, please also add it to tools/objtool/noreturns.h.
+   with __noreturn, please also add it to tools/objtool/noreturns.h and
+   include/linux/noreturns.h.
 
 4. file.o: warning: objtool: func(): can't find starting instruction
    or
diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh
index 81d120d05442..23b9813cd5e9 100755
--- a/tools/objtool/sync-check.sh
+++ b/tools/objtool/sync-check.sh
@@ -17,6 +17,7 @@ arch/x86/include/asm/emulate_prefix.h
 arch/x86/lib/x86-opcode-map.txt
 arch/x86/tools/gen-insn-attr-x86.awk
 include/linux/static_call_types.h
+tools/objtool/noreturns.h
 "
 
 SYNC_CHECK_FILES='
@@ -24,6 +25,7 @@ arch/x86/include/asm/inat.h
 arch/x86/include/asm/insn.h
 arch/x86/lib/inat.c
 arch/x86/lib/insn.c
+include/linux/noreturns.h
 '
 fi
 
-- 
2.43.5