linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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Date:	Fri, 11 Feb 2011 22:38:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Jason Baron <jbaron@...hat.com>, hpa@...or.com,
	rostedt@...dmis.org, mingo@...e.hu, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

On Fri, 2011-02-11 at 16:13 -0500, Mathieu Desnoyers wrote:
> 
> Thoughts ? 

 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
+
+struct jump_label_key {
+       void *ptr;
+};

 struct jump_label_entry {
        struct hlist_node hlist;
        struct jump_entry *table;
-       int nr_entries;
        /* hang modules off here */
        struct hlist_head modules;
        unsigned long key;
+       u32 nr_entries;
+       int refcount;
 };

#else

+struct jump_label_key {
+       int state;
+};

#endif



So why can't we make that jump_label_entry::refcount and
jump_label_key::state an atomic_t and be done with it?

Then the enabled case uses if (atomic_inc_return(&key->ptr->refcount) ==
1), and the disabled atomic_inc(&key->state).

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