linux-kernel - Re: [PATCH 20/30] x86, mm: remove hard-coded ASID limit checks

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Message-ID: <20171110122030.5zyplbb3tnwpa2vu@hirez.programming.kicks-ass.net>
Date:   Fri, 10 Nov 2017 13:20:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com, x86@...nel.org
Subject: Re: [PATCH 20/30] x86, mm: remove hard-coded ASID limit checks

On Wed, Nov 08, 2017 at 11:47:24AM -0800, Dave Hansen wrote:
> +#define CR3_HW_ASID_BITS 12
> +#define NR_AVAIL_ASIDS ((1<<CR3_AVAIL_ASID_BITS) - 1)

That evaluates to 4095

> -		VM_WARN_ON_ONCE(asid > 4094);
> +		VM_WARN_ON_ONCE(asid > NR_AVAIL_ASIDS);

Not the same number