linux-kernel - Re: [PATCH 6/8] i915,uaccess: Fix redundant CLAC

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Message-ID: <20190228175114.GG32494@hirez.programming.kicks-ass.net>
Date:   Thu, 28 Feb 2019 18:51:14 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Peter Anvin <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Lutomirski <luto@...capital.net>,
        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>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH 6/8] i915,uaccess: Fix redundant CLAC

On Thu, Feb 28, 2019 at 08:49:57AM -0800, Linus Torvalds wrote:
> Yes, it is redundant (but harmlessly so) if no fault occurs.

Oooh, there's a label hidden in unsafe_put_user()...

And yes, objtool seems to miss that, damn. I'll go stare at that.