[PATCH 17/27] x86/entry: Make rewind_stack_and_make_dead() a real function

[Josh Poimboeuf]

rewind_stack_and_make_dead() is SYM_CODE because it switches stacks, but
it's otherwise a callable function from C.

Convert it to SYM_FUNC so objtool can detect that it's noreturn and its
entry can be removed from the hard-coded global noreturns list.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 arch/x86/entry/entry_64.S | 7 +++----
 tools/objtool/noreturns.h | 1 -
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index c6d996593f329..1184bf1f9ed7e 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1480,9 +1480,7 @@ SYM_CODE_START(entry_SYSCALL32_ignore)
 SYM_CODE_END(entry_SYSCALL32_ignore)
 
 .pushsection .text, "ax"
-	__FUNC_ALIGN
-SYM_CODE_START_NOALIGN(rewind_stack_and_make_dead)
-	UNWIND_HINT_FUNC
+SYM_FUNC_START(rewind_stack_and_make_dead)
 	/* Prevent any naive code from trying to unwind to our caller. */
 	xorl	%ebp, %ebp
 
@@ -1491,7 +1489,8 @@ SYM_CODE_START_NOALIGN(rewind_stack_and_make_dead)
 	UNWIND_HINT_REGS
 
 	call	make_task_dead
-SYM_CODE_END(rewind_stack_and_make_dead)
+SYM_FUNC_END(rewind_stack_and_make_dead)
+STACK_FRAME_NON_STANDARD_FP(rewind_stack_and_make_dead)
 .popsection
 
 /*
diff --git a/tools/objtool/noreturns.h b/tools/objtool/noreturns.h
index 26f62f98bc8ef..ff93e94ee09a0 100644
--- a/tools/objtool/noreturns.h
+++ b/tools/objtool/noreturns.h
@@ -19,7 +19,6 @@ NORETURN(kunit_try_catch_throw)
 NORETURN(mpt_halt_firmware)
 NORETURN(panic)
 NORETURN(vpanic)
-NORETURN(rewind_stack_and_make_dead)
 NORETURN(rust_helper_BUG)
 NORETURN(sev_es_terminate)
 NORETURN(xen_cpu_bringup_again)
-- 
2.55.0