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Subject: Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after
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To: Borislav Petkov <bp@suse.de>
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Cc: Brian Gerst <brgerst@gmail.com>, the arch/x86 maintainers <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>, Denys Vlasenko <dvlasenk@redhat.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>
From: "H. Peter Anvin" <hpa@zytor.com>
Message-ID: <569FA333.7020401@zytor.com>
Date: Wed, 20 Jan 2016 07:09:39 -0800
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On 01/20/16 07:01, Borislav Petkov wrote:
> On Tue, Jan 19, 2016 at 08:02:01PM -0800, H. Peter Anvin wrote:
>> 	... "i" (1 << (bit & 7)),
>> 	    "m" (((const char *)boot_cpu_data->x86_capability)[bit >> 3]) ...
> 
> Nice!
> 
> I was going to do:
> 
> 		"i" (1 << (bit & 31)),
>                 "m" (((boot_cpu_data->x86_capability)[bit >> 5]))
> 

But then you're using testl and get long immediates.

(And the parentheses around boot_cpu_data->x86_capability are redundant.)

	-hpa