From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rik van Riel <riel@surriel.com>
Subject: Re: [PATCH 01/29] x86/fpu: Use ULL for shift in
 xfeature_uncompacted_offset()
Date: Wed, 28 Nov 2018 20:52:21 -0500
Message-ID: <cdd98047d6b8977f49bced95f8fd67f2953f632c.camel@surriel.com>
References: <20181128222035.2996-1-bigeasy@linutronix.de>
         <20181128222035.2996-2-bigeasy@linutronix.de>
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Cc: x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>,
        kvm@vger.kernel.org, "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Dave Hansen <dave.hansen@linux.intel.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        linux-kernel@vger.kernel.org
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20181128222035.2996-2-bigeasy@linutronix.de>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org


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On Wed, 2018-11-28 at 23:20 +0100, Sebastian Andrzej Siewior wrote:
> The xfeature mask is 64bit so a shift from a number to its mask
> should
> have LL prefix or else nr > 31 will be lost. This is not a problem
> now
> but should XFEATURE_MASK_SUPERVISOR gain a bit >31 then this check
> won't
> catch it.
>=20
> Use BIT_ULL() to compute a mask from a number.
>=20
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Reviewed-by: Rik van Riel <riel@surriel.com>

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