From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, mtosatti@redhat.com, mst@redhat.com
Subject: Re: [PATCH] Introduce bitmask for apic attention reasons.
Date: Thu, 19 Apr 2012 13:35:53 +0300 [thread overview]
Message-ID: <4F8FEA89.4020909@redhat.com> (raw)
In-Reply-To: <20120419102627.GA12768@redhat.com>
On 04/19/2012 01:26 PM, Gleb Natapov wrote:
> >
> > Unrelated: this pattern is probably common. Would be nice to have a
> > __deposit_bit() function.
> >
> What semantics should it have? Set bit A in bitmap B if value C is
> non-zero?
>
void __deposit_bit(bool bit, unsigned index, unsigned long *word)
{
if (bit)
__set_bit(...)
else
__clear_bit(...)
}
I think some processors have an instruction for it (not an s390 reference).
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-04-19 10:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 9:33 [PATCH] Introduce bitmask for apic attention reasons Gleb Natapov
2012-04-19 9:53 ` Avi Kivity
2012-04-19 10:26 ` Gleb Natapov
2012-04-19 10:35 ` Avi Kivity [this message]
2012-04-19 10:45 ` Avi Kivity
2012-04-19 10:05 ` Michael S. Tsirkin
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