linux-kernel - Re: [PATCH 07/20] x86/uaccess: Always inline force_valid

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Message-ID: <CALCETrX8ZAQpqxA+aRA7gdT3or33wj2Lmj40khmHp59JO=AVVg@mail.gmail.com>
Date:   Thu, 7 Mar 2019 10:05:43 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>, valentin.schneider@....com,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 07/20] x86/uaccess: Always inline force_valid_ss()

On Thu, Mar 7, 2019 at 3:52 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> arch/x86/kernel/signal.o: warning: objtool: restore_sigcontext()+0x3cc: call to force_valid_ss.isra.5() with UACCESS enabled
>
> XXX: move the callsite out of te AC=1 region instead?

Let's move it instead.  I looked at the code and it should be fine.

--Andy