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

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Message-ID: <CAK8P3a04Bm1_L7Qs-=0fu_yBd-R1FZvjjmtQu+Wd5PMnRQDPPg@mail.gmail.com>
Date:   Fri, 1 May 2020 15:08:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        "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 Fri, May 1, 2020 at 2:33 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Apr 30, 2020 at 08:07:33PM -0500, Josh Poimboeuf wrote:
> > On Thu, Apr 30, 2020 at 04:05:07PM +0200, Arnd Bergmann wrote:
> > > lib/strncpy_from_user.o: warning: objtool: strncpy_from_user()+0x133: call to do_strncpy_from_user() with UACCESS enabled
> > > lib/strnlen_user.o: warning: objtool: strnlen_user()+0x122: call to do_strnlen_user() with UACCESS enabled
> >
> > Does this fix it?
> >
>
> GCC is a moron, a static function with inline and a single callsite,
> let's out-of-line it, shees!, try this instead:

I suppose we were kind-of asking for it by passing
-fno-inline-functions-called-once
when CONFIG_DEBUG_SECTION_MISMATCH=y is set ;-)

      Arnd