linux-kernel - Re: [PATCH RFC tip/core/rcu 5/6] rcu: Make __kfree

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Message-ID: <1335444509.13683.13.camel@twins>
Date:	Thu, 26 Apr 2012 14:48:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org, Jan Engelhardt <jengelh@...ozas.de>
Subject: Re: [PATCH RFC tip/core/rcu 5/6] rcu: Make __kfree_rcu() less
 dependent on compiler choices

On Mon, 2012-04-23 at 09:42 -0700, Paul E. McKenney wrote:
> Currently, __kfree_rcu() is implemented as an inline function, and
> contains a BUILD_BUG_ON() that malfunctions if __kfree_rcu() is compiled
> as an out-of-line function.  Unfortunately, there are compiler settings
> (e.g., -O0) that can result in __kfree_rcu() being compiled out of line,
> resulting in annoying build breakage.  This commit therefore converts
> both __kfree_rcu() and __is_kfree_rcu_offset() from inline functions to
> macros to prevent such misbehavior on the part of the compiler.

The kernel very explicitly doesn't support being compiled with -O0, so
this is a non-issue, I think you can make it work if you add
-finline-functions.

I'd drop this, either make the entire kernel compile or don't bother.
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