From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] percpu_counter : add percpu_counter_add_fast()
Date: Thu, 21 Oct 2010 19:14:25 -0700
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Cc: Christoph Lameter <cl@linux.com>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	Dave Chinner <david@fromorbit.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
To: Nick Piggin <npiggin@kernel.dk>
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On Fri, 22 Oct 2010 12:58:45 +1100 Nick Piggin <npiggin@kernel.dk> wrote:

> > But what's really alarming is that the compiler (4.0.2) is cheerily
> > ignoring the inline directives and was generating out-of-line versions
> > of most of the percpu_counter.h functions into lib/proportions.s. 
> > That's rather a worry.
> 
> You you have the "ignore inlining"

# CONFIG_OPTIMIZE_INLINING is not set

> and "compile for size" turned on?

CONFIG_CC_OPTIMIZE_FOR_SIZE=y

> They often suck.

Everything sucks.  Are they any use?

With

# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_OPTIMIZE_INLINING=y

my kernel/built-in.o text went from 563638 bytes to 659852. 
That's rather a lot.

I haven't looked at this stuff in years.  Has anyone dug into it?