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SubjectRe: [PATCH] x86: use add_highpages_with_active_regions for high pages init

* Ingo Molnar <mingo@elte.hu> wrote:

> > use early_node_map to init high pages, so can remove page_is_ram and
> > page_is_reserved_early in the big loop with add_one_highpage
> >
> > also remove the page_is_reserved_early that is not needed.
>
> applied to tip/x86/mpparse for testing, thanks.
>
> Andrew: mm/page_alloc.c modification.

i ended up doing the change below.

'bad_ppro' looked quite ugly in mm/page_alloc.c, and there was also a
64-bit build failure, so i moved the function out of page_alloc.c, into
the 32-bit x86 code.

Ingo

------------->
commit 30847a7f5650248cd8435b7646eef0b9cfd66095
Author: Ingo Molnar <mingo@elte.hu>
Date: Sat Jun 14 10:41:09 2008 +0200

x86: move add_highpages_with_active_regions() to 32-bit

this is an x86 32-bit highmem-only function, so move it out of
mm/page_alloc.c.

this also solves this 64-bit build failure:

mm/built-in.o: In function `add_highpages_with_active_regions':
(.init.text+0x1833): undefined reference to `add_one_highpage_init'

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 6652f14..3400289 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -287,7 +287,8 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
pkmap_page_table = pte;
}

-void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
+static void __init
+add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
{
if (!(bad_ppro && page_kills_ppro(pfn))) {
ClearPageReserved(page);
@@ -298,6 +299,30 @@ void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
SetPageReserved(page);
}

+void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn,
+ unsigned long end_pfn, int bad_ppro)
+{
+ int i;
+ int node_pfn;
+ struct page *page;
+ unsigned long final_start_pfn, final_end_pfn;
+
+ for_each_active_range_index_in_nid(i, nid) {
+ final_start_pfn = max(start_pfn, early_node_map[i].start_pfn);
+ final_end_pfn = min(end_pfn, early_node_map[i].end_pfn);
+ if (final_start_pfn >= final_end_pfn)
+ continue;
+
+ for (node_pfn = final_start_pfn; node_pfn < final_end_pfn;
+ node_pfn++) {
+ if (!pfn_valid(node_pfn))
+ continue;
+ page = pfn_to_page(node_pfn);
+ add_one_highpage_init(page, node_pfn, bad_ppro);
+ }
+ }
+}
+
#ifndef CONFIG_NUMA
static void __init set_highmem_pages_init(int bad_ppro)
{
diff --git a/include/asm-x86/highmem.h b/include/asm-x86/highmem.h
index e153f3b..85c4fea 100644
--- a/include/asm-x86/highmem.h
+++ b/include/asm-x86/highmem.h
@@ -74,6 +74,9 @@ struct page *kmap_atomic_to_page(void *ptr);

#define flush_cache_kmaps() do { } while (0)

+extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
+ unsigned long end_pfn, int bad_ppro);
+
#endif /* __KERNEL__ */

#endif /* _ASM_HIGHMEM_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4a5d33f..c4f6553 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1010,8 +1010,6 @@ extern unsigned long find_min_pfn_with_active_regions(void);
extern unsigned long find_max_pfn_with_active_regions(void);
extern void free_bootmem_with_active_regions(int nid,
unsigned long max_low_pfn);
-extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
- unsigned long end_pfn, int bad_ppro);
extern void sparse_memory_present_with_active_regions(int nid);
#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
extern int early_pfn_to_nid(unsigned long pfn);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ad1b684..26a028c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2955,30 +2955,6 @@ void __init free_bootmem_with_active_regions(int nid,
}
}

-extern void add_one_highpage_init(struct page *, int, int);
-void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn,
- unsigned long end_pfn, int bad_ppro)
-{
- int i;
- int node_pfn;
- struct page *page;
- unsigned long final_start_pfn, final_end_pfn;
-
- for_each_active_range_index_in_nid(i, nid) {
- final_start_pfn = max(start_pfn, early_node_map[i].start_pfn);
- final_end_pfn = min(end_pfn, early_node_map[i].end_pfn);
- if (final_start_pfn >= final_end_pfn)
- continue;
-
- for (node_pfn = final_start_pfn; node_pfn < final_end_pfn;
- node_pfn++) {
- if (!pfn_valid(node_pfn))
- continue;
- page = pfn_to_page(node_pfn);
- add_one_highpage_init(page, node_pfn, bad_ppro);
- }
- }
-}
/**
* sparse_memory_present_with_active_regions - Call memory_present for each active range
* @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used.

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