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@xxxxxxxxxx> 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@xxxxxxxxxx>
> >---
> > 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@xxxxxxxxxx>--------------ooO--(_)--Ooo--
--
Kind regards,
Minchan Kim
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