linux-kernel - Re: [PATCH v2 03/10] x86: Add a type field to alt

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Date:   Thu, 18 Jan 2018 12:32:00 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>
Subject: Re: [PATCH v2 03/10] x86: Add a type field to alt_instr

On Tue, Jan 16, 2018 at 03:28:28PM +0100, Peter Zijlstra wrote:
> Add a type field to the alternative description. For now this will be
> used to annotate static_cpu_has() but possible future uses include
> using it to implement alternative alignment and special NOP handling.
> 
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/x86/include/asm/alternative-asm.h |    3 ++-
>  arch/x86/include/asm/alternative.h     |    6 +++++-

There's a

	DPRINTK("feat: %d*32+%d, old: (%p, len: %d), repl: (%p, len: %d), pad: %d",

in arch/x86/kernel/alternative.c which dumps the whole alt_instr struct
for debugging. Please add the type there too.

With that and Josh's suggestion added:

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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