linux-kernel - Re: [PATCH] mm,vmacache: inline vmacache_valid

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Date:	Mon, 7 Jul 2014 15:07:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm,vmacache: inline vmacache_valid_mm()

On Fri, 04 Jul 2014 14:08:03 -0700 Davidlohr Bueso <davidlohr@...com> wrote:

> From: Davidlohr Bueso <davidlohr@...com>
> 
> No brainer for this little function.
> 
> ...
>
> --- a/mm/vmacache.c
> +++ b/mm/vmacache.c
> @@ -50,7 +50,7 @@ void vmacache_flush_all(struct mm_struct *mm)
>   * Also handle the case where a kernel thread has adopted this mm via use_mm().
>   * That kernel thread's vmacache is not applicable to this mm.
>   */
> -static bool vmacache_valid_mm(struct mm_struct *mm)
> +static inline bool vmacache_valid_mm(struct mm_struct *mm)
>  {
>  	return current->mm == mm && !(current->flags & PF_KTHREAD);
>  }

The patch doesn't actually do anything.

- gcc ignores `inline'

- gcc will inline this function anwyay

- if we really really need a hammer, we use __always_inline, along
  with a comment explaining why.

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