linux-kernel - Re: [PATCH] x86/nospec: Fixup array_index_nospec

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Message-ID: <CA+55aFy4UkbAgghSGN_vcLLF229avLmdx8nWyLMSBPRuD+vCvw@mail.gmail.com>
Date:   Tue, 6 Feb 2018 17:50:21 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/nospec: Fixup array_index_nospec_mask() asm constraint

On Tue, Feb 6, 2018 at 5:33 PM, Dan Williams <dan.j.williams@...el.com> wrote:
> Allow the compiler to handle @size as an immediate value rather than
> allocating a register.

Actually, maybe that "ir" should be "g".

Because it's fine if it's a memory location too. "cmp" takes pretty
much anything, as long as the thing we compare _to_ is a register.

              Linus