linux-kernel - Re: Remaining randconfig objtool warnings, linux-next-20200428

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Date:   Thu, 30 Apr 2020 19:28:58 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Remaining randconfig objtool warnings, linux-next-20200428

On Thu, Apr 30, 2020 at 04:05:07PM +0200, Arnd Bergmann wrote:
> lib/locking-selftest.o: warning: objtool: locking_selftest()+0x117f: PUSHF stack exhausted
> lib/locking-selftest.o: warning: objtool: ww_tests()+0x1083: PUSHF stack exhausted

Peter,

These functions have a bunch of irqs_disabled() checks, which means a
bunch of PUSHFs with no POPFs.

Am I reading it correctly that objtool assumes PUSHF is always paired
with POPF?  irqs_disabled() doesn't do that.

-- 
Josh