From: Michael Ellerman <mpe@ellerman.id.au>
To: David Binderman <dcb314@hotmail.com>,
"benh\@kernel.crashing.org" <benh@kernel.crashing.org>,
"paulus\@samba.org" <paulus@samba.org>,
"linuxppc-dev\@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: linux-4.14-rc1/arch/powerpc/perf/hv-24x7.c:541: bad condition ?
Date: Tue, 19 Sep 2017 20:37:10 +1000 [thread overview]
Message-ID: <87poankm95.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <HE1PR0802MB2331572C98E215722EE4411C9C630@HE1PR0802MB2331.eurprd08.prod.outlook.com>
David Binderman <dcb314@hotmail.com> writes:
> Hello there,
>
> linux-4.14-rc1/arch/powerpc/perf/hv-24x7.c:543]: (warning) Identical condition 's1<s2', second condition is always false
>
> Source code is
>
> if (s1 < s2)
> return 1;
> if (s2 > s1)
> return -1;
>
> Suggest code rework.
Um thanks.
It's trying to implement a sort comparison returning -1, 0, 1.
So it's pretty obviously wrong, but also harmless AFAICS, because it's
just an optimisation before doing a full comparison using memcmp().
So yeah we should fix it, but not an actual bug AFAICS.
cheers
next parent reply other threads:[~2017-09-19 10:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <HE1PR0802MB2331572C98E215722EE4411C9C630@HE1PR0802MB2331.eurprd08.prod.outlook.com>
2017-09-19 10:37 ` Michael Ellerman [this message]
2017-09-21 11:01 ` Michael Ellerman
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