x86,objtool: Explicitly mark idtentry_body()s tail REACHABLE

Objtool can figure out that some \cfunc()s are noreturn and then complains about certain instances having unreachable tails: vmlinux.o: warning: objtool: asm_exc_xen_unknown_trap()+0x16: unreachable instruction Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Josh Poimboeuf <[email protected]> Link: https://lore.kernel.org/r/[email protected]
chewitt · Apr 19, 2022 · d66e9d5 · d66e9d5
1 parent d4e5268
commit d66e9d5
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
@@ -337,6 +337,9 @@ SYM_CODE_END(ret_from_fork)
 
 	call	\cfunc
 
+	/* For some configurations \cfunc ends up being a noreturn. */
+	REACHABLE
+
 	jmp	error_return
 .endm