linux-kernel - Re: [PATCH 1/1] netfilter/jump_label: use HAVE_JUMP

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Date:	Thu, 21 Aug 2014 20:53:19 +0800 (GMT+08:00)
From:	"Zhouyi Zhou" <yizhouzhou@....ac.cn>
To:	"Florian Westphal" <fw@...len.de>
Cc:	"Zhouyi Zhou" <zhouzhouyi@...il.com>, pablo@...filter.org,
	kaber@...sh.net, kadlec@...ckhole.kfki.hu, davem@...emloft.net,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbaron@...mai.com
Subject: Re: [PATCH 1/1] netfilter/jump_label: use HAVE_JUMP_LABEL?

Thanks Florian for reviewing

> -----Original Messages-----
> From: "Florian Westphal" <fw@...len.de>

> 
> Zhouyi Zhou <zhouzhouyi@...il.com> wrote:
> > 
> > CONFIG_JUMP_LABEL doesn't ensure HAVE_JUMP_LABEL, if it
> > is not the case use maintainers's own mutex to guard
> > the modification of global values.

CONFIG_JUMP_LABEL says the user wants to use jump labels.
But we also need the toolchain to support it.

That is reflected in CC_HAVE_ASM_GOTO=y, and if both are
set then HAVE_JUMP_LABEL is set to true.

> I don't understand this patch.
> 
> What is the problem you are fixing?

There is basically no real problem here.
This patch only tries to make kernel code that using 
static_key infrastructure appears "unified"
> 
> The intent is to only use static_key infrastructure
> if user has enabled CONFIG_JUMP_LABEL.

The other parts of kernel either use #ifdef HAVE_JUMP_LABEL,
or use no "#ifdef" at all(the two exceptions are netfilter 
and powerpc modules which I send patches to both).

Jason has suggested me to make the patches:
https://lkml.org/lkml/2014/8/20/761

"Unified" is the reason, I guess :-)
so rookies like me can have unified examples to follow


 
Cheers
Zhouyi






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