linux-kernel - Re: [tip:perf/core] perf/x86: Add generic Intel uncore PMU support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FE3ACCA.5000705@zytor.com>
Date:	Thu, 21 Jun 2012 16:22:50 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	zheng.z.yan@...el.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Add generic Intel uncore PMU support

On 06/21/2012 04:18 PM, Andrew Morton wrote:
>>
>> So why is ktime_t unsigned?
> 
> err, actually, it isn't.  But lots of the APIs to manipulate ktime_t
> use u64.  Reason?
> 
> I do agree that time quantities should be signed.

No idea... probably because when representing an actual wall time since
the POSIX epoch that can happen during the poweron time on the system,
the number will be positive since the POSIX epoch predates Linux.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/