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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 1 Mar 2019 08:17:57 -0800
Message-ID: <CAHk-=wiB2gRa8tsa3ndxgyTe0FZ+M40oe_ffW8jCoAu_KjQgHw@mail.gmail.com>
Subject: Re: [PATCH 6/8] i915,uaccess: Fix redundant CLAC
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>, Peter Anvin <hpa@zytor.com>,
        Julien Thierry <julien.thierry@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Ingo Molnar <mingo@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        James Morse <james.morse@arm.com>, valentin.schneider@arm.com,
        Brian Gerst <brgerst@gmail.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Andrew Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Chris Wilson <chris@chris-wilson.co.uk>
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On Fri, Mar 1, 2019 at 2:35 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> With the dodgy patch:
>
> CC      drivers/gpu/drm/i915/i915_gem_execbuffer.o
> drivers/gpu/drm/i915/i915_gem_execbuffer.o: warning: objtool: eb_relocate_slow()+0x1f9: call to kvfree() with UACCESS enabled
> drivers/gpu/drm/i915/i915_gem_execbuffer.o: warning: objtool: i915_gem_execbuffer2_ioctl()+0x315: call to kvfree() with UACCESS enabled

Ok, so it looks like your patch does the right thing. Your fixups to
i915_gem_execbuffer.c (and the already commented-upon copy_user_tail
thing) also look sane.

               Linus