linux-kernel - Re: [PATCH] vmalloc: remove #ifdef in function body

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Date:	Wed, 21 Dec 2011 07:13:49 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Minchan Kim" <minchan@...nel.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmalloc: remove #ifdef in function body

On Wed, 21 Dec 2011 06:17:59 +0100, Minchan Kim <minchan@...nel.org> wrote:
> We don't like function body which include #ifdef.
> If we can, define null function to go out compile time.
> It's trivial, no functional change.

It actually adds “flush_tlb_kenel_range()” call to the function so there
is functional change.

> Signed-off-by: Minchan Kim <minchan@...nel.org>
> ---
>  mm/vmalloc.c |    9 +++++++--
>  1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 0aca3ce..e1fa5a6 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -505,6 +505,7 @@ static void unmap_vmap_area(struct vmap_area *va)
>  	vunmap_page_range(va->va_start, va->va_end);
>  }
>+#ifdef CONFIG_DEBUG_PAGEALLOC
>  static void vmap_debug_free_range(unsigned long start, unsigned long end)
>  {
>  	/*
> @@ -520,11 +521,15 @@ static void vmap_debug_free_range(unsigned long start, unsigned long end)
>  	 * debugging doesn't do a broadcast TLB flush so it is a lot
>  	 * faster).
>  	 */
> -#ifdef CONFIG_DEBUG_PAGEALLOC
>  	vunmap_page_range(start, end);
>  	flush_tlb_kernel_range(start, end);
> -#endif
>  }
> +#else
> +static inline void vmap_debug_free_range(unsigned long start,
> +					unsigned long end)
> +{
> +}
> +#endif
> /*
>   * lazy_max_pages is the maximum amount of virtual address space we gather up

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--
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