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

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Date:	Wed, 21 Dec 2011 15:22:32 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmalloc: remove #ifdef in function body

On Wed, Dec 21, 2011 at 07:13:49AM +0100, Michal Nazarewicz wrote:
> 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.

Sorry. I can't understand your point.
Why does it add flush_tlb_kernel_range in case of !CONFIG_DEBUG_PAGEALLOC?

> 
> >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--

-- 
Kind regards,
Minchan Kim
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