linux-kernel - Re: [RFC][PATCH] signal: replace !likely with unlikely!

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Message-ID: <541416AB.7000808@nod.at>
Date:	Sat, 13 Sep 2014 12:04:27 +0200
From:	Richard Weinberger <richard@....at>
To:	Li RongQing <roy.qing.li@...il.com>,
	Guenter Roeck <linux@...ck-us.net>
CC:	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	fabf@...net.be, jkosina@...e.cz,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>, oleg@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [RFC][PATCH] signal: replace !likely with unlikely!

Am 13.09.2014 04:48, schrieb Li RongQing:
> I did not test, how to test it?

Compare the object files of both variants to find out whether both create
semantically equivalent code and whether the un/likely have an effect.
i.e. objdump -S -d kernel/signal.o
I guess you can just remove the likely as gcc is smart enough to detect the "goto ret;"
as an unlikely taken branch.

Thanks,
//richard
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