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.
> #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.
Otherwise, this patch looks good to me.
Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
> +
> +/*
> + * 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
>
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