From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Chen Gang <gang.chen@asianux.com>
Cc: chenhui.zhao@freescale.com, "paulus@samba.org" <paulus@samba.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH v2] powerpc: kernel: remove useless code which related with 'max_cpus'
Date: Thu, 25 Jul 2013 16:03:45 +1000 [thread overview]
Message-ID: <1374732225.6142.66.camel@pasglop> (raw)
In-Reply-To: <1374731505.6142.64.camel@pasglop>
On Thu, 2013-07-25 at 15:51 +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2013-07-25 at 13:24 +0800, Chen Gang wrote:
> > For an extern function, if the performance is not sensible, better to
> > have the return value which can indicate the failure with the negative
> > number.
>
> The return value is meaningless.
>
> We don't have a good way to handle it. It has no defined semantics. What
> does "failure" means in that case ? Nothing !
>
> So just remove it.
Note: If you want to create a concept of smp_ops->probe() failing, then
not only you need to check all the implementations, but *also* add
something sensible to do when it fails ... such as disabling bringup of
CPUs.
In this case however, we have put the burden of doing whatever makes
sense in the probe() function itself. If can adjust the possible map if
it fails.
Cheers,
Ben.
next prev parent reply other threads:[~2013-07-25 6:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-22 5:58 [PATCH] powerpc: kernel: remove useless code which related with 'max_cpus' Chen Gang
2013-07-22 6:18 ` Srivatsa S. Bhat
2013-07-22 6:27 ` Chen Gang
2013-07-22 6:40 ` [PATCH v2] " Chen Gang
2013-07-22 6:51 ` Srivatsa S. Bhat
2013-07-22 7:03 ` Chen Gang
2013-07-23 13:44 ` Michael Ellerman
2013-07-24 0:28 ` Chen Gang
2013-07-24 1:16 ` Michael Ellerman
2013-07-24 2:09 ` Chen Gang
2013-07-25 3:15 ` Michael Ellerman
2013-07-25 4:02 ` Chen Gang
2013-07-25 5:16 ` Benjamin Herrenschmidt
2013-07-25 5:24 ` Chen Gang
2013-07-25 5:51 ` Benjamin Herrenschmidt
2013-07-25 6:03 ` Benjamin Herrenschmidt [this message]
2013-07-25 6:30 ` Chen Gang
2013-07-25 6:17 ` Chen Gang
2013-07-25 7:33 ` Benjamin Herrenschmidt
2013-07-25 7:59 ` Chen Gang
2013-07-25 8:06 ` Benjamin Herrenschmidt
2013-07-25 8:22 ` Chen Gang
2013-07-25 8:28 ` Benjamin Herrenschmidt
2013-07-25 8:36 ` Chen Gang
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