linux-kernel - Re: [PATCH 4/6] signal: sigprocmask() should do retarget_shared

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Message-ID: <BANLkTim7D_+nmjU9ewZWoKftZ+_7YSegVQ@mail.gmail.com>
Date:	Thu, 14 Apr 2011 13:33:14 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] signal: sigprocmask() should do retarget_shared_pending()

On Thu, Apr 14, 2011 at 1:10 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> Well, I don't know the common definition... But please note that
> signandsets() does ((x) & ~(y)), so I defined nor as (x | ~y) by analogy.

Yeah, "nand" is really "not and" (ie "~((x)&(y))").

The expression ((x) & ~(y)) should typically be called "andn" (see for
example the x86 instruction set "pandn" and "andnpd" or whatever they
are called for sse instructions).

And "nor" really should be "~(x|y)". You want the "orn" combination
(and the famously hard-to-google "porn" instruction for the vectorized
version)

                Linus
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