linux-kernel - Re: [tip:core/objtool 2/25] arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show

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Date:   Wed, 3 Apr 2019 16:00:42 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [tip:core/objtool 2/25] arch/x86/kernel/dumpstack.o: warning:
 objtool: oops_end() falls through to next function show_regs()

On Thu, Apr 04, 2019 at 01:43:05AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/objtool
> head:   64604d54d3115fee89598bfb6d8d2252f8a2d114
> commit: 37686b1353cfc30e127cef811959cdbcd0495d98 [2/25] tracing: Improve "if" macro code generation
> config: x86_64-randconfig-e2-03311307 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
>         git checkout 37686b1353cfc30e127cef811959cdbcd0495d98
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All warnings (new ones prefixed by >>):
> 
> >> arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show_regs()

This should be fixed by adding rewind_stack_do_exit() to the objtool
noreturn list.  I'll post a proper patch soon.

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 38b0517dc49e..ac743a1d53ab 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -143,6 +143,7 @@ static int __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"fortify_panic",
 		"usercopy_abort",
 		"machine_real_restart",
+		"rewind_stack_do_exit",
 	};
 
 	if (func->bind == STB_WEAK)