linux-kernel - Re: [PATCH] rbtree: include linux/compiler.h for definition of __always

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Message-ID: <CANN689HrJMyQSXTjwJtMmyxJvccgMd-9EzRA-JsgDCp+STX6qw@mail.gmail.com>
Date:	Mon, 22 Oct 2012 14:56:21 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] rbtree: include linux/compiler.h for definition of __always_inline

On Mon, Oct 22, 2012 at 10:01 AM, Will Deacon <will.deacon@....com> wrote:
> rb_erase_augmented is a static function annotated with __always_inline.
> This causes a compile failure when attempting to use the rbtree
> implementation as a library (e.g. kvm tool):
>
> rbtree_augmented.h:125:24: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
>
> This patch includes linux/compiler.h in rbtree_augmented.h so that the
> __always_inline macro is resolved correctly.
>
> Cc: Pekka Enberg <penberg@...nel.org>
> Cc: Michel Lespinasse <walken@...gle.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Will Deacon <will.deacon@....com>

Just curious - what are you going to implement with augmented rbtrees
in kvm tool ?

If the basic rbtree or the interval tree implementations are
sufficient for your usage, you should try using that (in which case
you won't need this header fix).

But either way, the header fix is correct and will be required when
someone wants to use augmented rbtrees outside of the kernel. I just
didn't think that day would come so fast :)

Reviewed-by: Michel Lespinasse <walken@...gle.com>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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