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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) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220408094718.441854969@infradead.org
This commit is contained in:
Peter Zijlstra 2022-04-08 11:45:56 +02:00
parent d4e5268a08
commit d66e9d50ea
1 changed files with 3 additions and 0 deletions
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arch/x86/entry/entry_64.S
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@ -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