linux-kernel - Re: [PATCH] reduce large do_mount stack usage with noinlines

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Date:	Wed, 6 Feb 2008 15:22:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] reduce large do_mount stack usage with noinlines

On Wed, 06 Feb 2008 17:11:38 -0600
Eric Sandeen <sandeen@...hat.com> wrote:

>  /*
>   * recursively change the type of the mountpoint.
> + * noinline this do_mount helper to save do_mount stack space.
>   */
> -static int do_change_type(struct nameidata *nd, int flag)
> +static noinline int do_change_type(struct nameidata *nd, int flag)

What we could do here is defined a new noinline_because_of_stack_suckiness
and use that.  Reasons:

- self-documenting, so we don't need to comment each site

- can be made a no-op for suitable __GNUC__ values if gcc ever fixes this

- our children we can go through and delete them all when nobody is using
  the offending gcc versions any more.

what thinkest thou?
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