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Subject[2/6] Xen VMM #4: return code for arch_free_page
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This patch adds a return value to the existing arch_free_page function
that indicates whether the normal free routine still has work to
do. The only architecture that currently uses arch_free_page is arch
'um'. arch xen needs this for 'foreign pages' - pages that don't
belong to the page allocator but are instead managed by custom
allocators. Such pages are marked using PG_arch_1.

Signed-off-by: ian.pratt@cl.cam.ac.uk

---


diff -Nurp pristine-linux-2.6.10-rc3/include/linux/gfp.h tmp-linux-2.6.10-rc3-xen.patch/include/linux/gfp.h
--- pristine-linux-2.6.10-rc3/include/linux/gfp.h 2004-12-03 21:53:07.000000000 +0000
+++ tmp-linux-2.6.10-rc3-xen.patch/include/linux/gfp.h 2004-12-08 00:52:40.000000000 +0000
@@ -74,8 +74,12 @@ struct vm_area_struct;
* optimized to &contig_page_data at compile-time.
*/

+/*
+ * If arch_free_page returns non-zero then the generic free_page code can
+ * immediately bail: the arch-specific function has done all the work.
+ */
#ifndef HAVE_ARCH_FREE_PAGE
-static inline void arch_free_page(struct page *page, int order) { }
+#define arch_free_page(page, order) 0
#endif

extern struct page *
diff -Nurp pristine-linux-2.6.10-rc3/mm/page_alloc.c tmp-linux-2.6.10-rc3-xen.patch/mm/page_alloc.c
--- pristine-linux-2.6.10-rc3/mm/page_alloc.c 2004-12-03 21:52:41.000000000 +0000
+++ tmp-linux-2.6.10-rc3-xen.patch/mm/page_alloc.c 2004-12-08 00:56:48.000000000 +0000
@@ -278,7 +278,8 @@ void __free_pages_ok(struct page *page,
LIST_HEAD(list);
int i;

- arch_free_page(page, order);
+ if (arch_free_page(page, order))
+ return;

mod_page_state(pgfree, 1 << order);
for (i = 0 ; i < (1 << order) ; ++i)
@@ -508,7 +509,8 @@ static void fastcall free_hot_cold_page(
struct per_cpu_pages *pcp;
unsigned long flags;

- arch_free_page(page, 0);
+ if (arch_free_page(page, 0))
+ return;

kernel_map_pages(page, 1, 0);
inc_page_state(pgfree);
diff -Nurp pristine-linux-2.6.10-rc2/arch/um/kernel/physmem.c tmp-linux-2.6.10-rc2-xen.patch/arch/um/kernel/physmem.c
--- pristine-linux-2.6.10-rc2/arch/um/kernel/physmem.c 2004-11-19 20:04:30.000000000 +0000
+++ tmp-linux-2.6.10-rc2-xen.patch/arch/um/kernel/physmem.c 2004-11-19 20:05:33.000000000 +0000
@@ -225,7 +225,7 @@ EXPORT_SYMBOL(physmem_forget_descriptor)
EXPORT_SYMBOL(physmem_remove_mapping);
EXPORT_SYMBOL(physmem_subst_mapping);

-void arch_free_page(struct page *page, int order)
+void __arch_free_page(struct page *page, int order)
{
void *virt;
int i;
diff -Nurp pristine-linux-2.6.10-rc2/include/asm-um/page.h tmp-linux-2.6.10-rc2-xen.patch/include/asm-um/page.h
--- pristine-linux-2.6.10-rc2/include/asm-um/page.h 2004-11-19 20:04:52.000000000 +0000
+++ tmp-linux-2.6.10-rc2-xen.patch/include/asm-um/page.h 2004-11-19 20:05:33.000000000 +0000
@@ -46,7 +46,8 @@ extern void *to_virt(unsigned long phys)
extern struct page *arch_validate(struct page *page, int mask, int order);
#define HAVE_ARCH_VALIDATE

-extern void arch_free_page(struct page *page, int order);
+extern void __arch_free_page(struct page *page, int order);
+#define arch_free_page(page, order) (__arch_free_page((page), (order)), 0)
#define HAVE_ARCH_FREE_PAGE

#endif
-
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