From: Linus Torvalds <torvalds@linux-foundation.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Nikita V. Youshchenko" <nyoushchenko@mvista.com>,
Matt Fleming <matt@console-pimps.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/6] signal: sigprocmask() should do retarget_shared_pending()
Date: Thu, 14 Apr 2011 13:33:14 -0700 [thread overview]
Message-ID: <BANLkTim7D_+nmjU9ewZWoKftZ+_7YSegVQ@mail.gmail.com> (raw)
In-Reply-To: <20110414201045.GB25828@redhat.com>
On Thu, Apr 14, 2011 at 1:10 PM, Oleg Nesterov <oleg@redhat.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
next prev parent reply other threads:[~2011-04-14 20:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-11 17:19 [RFC PATCH 0/6] signal: sigprocmask fixes Oleg Nesterov
2011-04-11 17:20 ` [PATCH 1/6] signal: introduce retarget_shared_pending() Oleg Nesterov
2011-04-12 11:39 ` Matt Fleming
2011-04-11 17:20 ` [PATCH 2/6] signal: retarget_shared_pending: consider shared/unblocked signals only Oleg Nesterov
2011-04-12 11:40 ` Matt Fleming
2011-04-12 19:53 ` Oleg Nesterov
2011-04-11 17:21 ` [PATCH 3/6] signal: sigprocmask: narrow the scope of ->sigloc Oleg Nesterov
2011-04-12 11:38 ` Matt Fleming
2011-04-11 17:21 ` [PATCH 4/6] signal: sigprocmask() should do retarget_shared_pending() Oleg Nesterov
2011-04-12 12:07 ` Matt Fleming
2011-04-12 14:32 ` Linus Torvalds
2011-04-14 19:36 ` Oleg Nesterov
2011-04-12 18:33 ` Tejun Heo
2011-04-14 20:10 ` Oleg Nesterov
2011-04-14 20:33 ` Linus Torvalds [this message]
2011-04-11 17:22 ` [PATCH 5/6] x86: signal: handle_signal() should use sigprocmask() Oleg Nesterov
2011-04-12 12:15 ` Matt Fleming
2011-04-11 17:22 ` [PATCH 6/6] x86: signal: sys_rt_sigreturn() " Oleg Nesterov
2011-04-12 12:17 ` Matt Fleming
2011-04-14 20:15 ` Oleg Nesterov
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