On Tue, Apr 21, 2020 at 10:24:35AM +0800, Baoquan He wrote:
> On 04/12/20 at 10:48pm, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> >
> > The early_pfn_to_nid() and it's helper __early_pfn_to_nid() are spread
> > around include/linux/mm.h, include/linux/mmzone.h and mm/page_alloc.c.
> >
> > Drop unused stub for __early_pfn_to_nid() and move its actual generic
> > implementation close to its users.
> >
> > Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> > ---
> > include/linux/mm.h | 4 ++--
> > include/linux/mmzone.h | 9 --------
> > mm/page_alloc.c | 51 +++++++++++++++++++++---------------------
> > 3 files changed, 27 insertions(+), 37 deletions(-)
> >
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 5a323422d783..a404026d14d4 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -2388,9 +2388,9 @@ extern void sparse_memory_present_with_active_regions(int nid);
> >
> > #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
> > !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
> > -static inline int __early_pfn_to_nid(unsigned long pfn,
> > - struct mminit_pfnnid_cache *state)
> > +static inline int early_pfn_to_nid(unsigned long pfn)
> > {
> > + BUILD_BUG_ON(IS_ENABLED(CONFIG_NUMA));
> > return 0;
> > }
>
> It's better to make a separate patch to drop __early_pfn_to_nid() here.
Not sure it's really worth it.
This patch anyway only moves the code around without any actual changes.
> > #else
> > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> > index 1b9de7d220fb..7b5b6eba402f 100644
> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -1078,15 +1078,6 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
> > #include <asm/sparsemem.h>
> > #endif
> >
> > -#if !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) && \
> > - !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
> > -static inline unsigned long early_pfn_to_nid(unsigned long pfn)
> > -{
> > - BUILD_BUG_ON(IS_ENABLED(CONFIG_NUMA));
> > - return 0;
> > -}
> > -#endif
> > -
> > #ifdef CONFIG_FLATMEM
> > #define pfn_to_nid(pfn) (0)
> > #endif
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 0d012eda1694..1ac775bfc9cf 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -1504,6 +1504,31 @@ void __free_pages_core(struct page *page, unsigned int order)
>
> #if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \
> defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
>
> This is the upper layer of ifdeffery scope.
> >
> > static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata;
> >
> > +#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
>
> Moving __early_pfn_to_nid() here makes the upper layer of ifdeferry
> scope a little werid. But seems no better way to optimize it.
It gets a bit better after patch 3 :)
> Otherwise, this patch looks good to me.
>
> Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
Thanks!
> > +
> > +/*
> > + * Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
> > + */
> > +int __meminit __early_pfn_to_nid(unsigned long pfn,
> > + struct mminit_pfnnid_cache *state)
> > +{
> > + unsigned long start_pfn, end_pfn;
> > + int nid;
> > +
> > + if (state->last_start <= pfn && pfn < state->last_end)
> > + return state->last_nid;
> > +
> > + nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
> > + if (nid != NUMA_NO_NODE) {
> > + state->last_start = start_pfn;
> > + state->last_end = end_pfn;
> > + state->last_nid = nid;
> > + }
> > +
> > + return nid;
> > +}
> > +#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
> > +
> > int __meminit early_pfn_to_nid(unsigned long pfn)
> > {
> > static DEFINE_SPINLOCK(early_pfn_lock);
> > @@ -6298,32 +6323,6 @@ void __meminit init_currently_empty_zone(struct zone *zone,
> > zone->initialized = 1;
> > }
> >
> > -#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> > -#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
> > -
> > -/*
> > - * Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
> > - */
> > -int __meminit __early_pfn_to_nid(unsigned long pfn,
> > - struct mminit_pfnnid_cache *state)
> > -{
> > - unsigned long start_pfn, end_pfn;
> > - int nid;
> > -
> > - if (state->last_start <= pfn && pfn < state->last_end)
> > - return state->last_nid;
> > -
> > - nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
> > - if (nid != NUMA_NO_NODE) {
> > - state->last_start = start_pfn;
> > - state->last_end = end_pfn;
> > - state->last_nid = nid;
> > - }
> > -
> > - return nid;
> > -}
> > -#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
> > -
> > /**
> > * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range
> > * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed.
> > --
> > 2.25.1
> >
>
--
Sincerely yours,
Mike.
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