On (24/07/07 22:01), Andrew Morton didst pronounce:
> On Tue, 13 Mar 2007 10:42:02 +0000 [email protected] (Mel Gorman) wrote:
>
> > There are problems in the use of SPARSEMEM and pageblock flags that causes
> > problems on ia64.
> >
> > <SNIP>
>
> SuperH allmodconfig blew up:
>
> mm/sparse.c: In function `sparse_init':
> mm/sparse.c:482: error: implicit declaration of function `sparse_early_usemap_alloc'
> mm/sparse.c:482: warning: assignment makes pointer from integer without a cast
> mm/sparse.c: In function `sparse_add_one_section':
> mm/sparse.c:553: error: implicit declaration of function `__kmalloc_section_usemap'
> mm/sparse.c:553: warning: assignment makes pointer from integer without a cast
This error is due to a bad interaction between
generic-virtual-memmap-support-for-sparsemem.patch and
fix-corruption-of-memmap-on-ia64-sparsemem-when-mem_section-is-not-a-power-of-2.patch
. Functions that are needed whether CONFIG_SPARSEMEM_VMEMMAP is set are
not are depending on CONFIG_SPARSEMEM_VMEMMAP . This breaks on arch/sh
for example where SPARSEMEM may be set but not NUMA.
Signed-off-by: Mel Gorman <[email protected]>
---
sparse.c | 58 +++++++++++++++++++++++++++++-----------------------------
1 file changed, 29 insertions(+), 29 deletions(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm1-clean/mm/sparse.c linux-2.6.23-rc1-mm1-005-sh-sparsemem-fix/mm/sparse.c
--- linux-2.6.23-rc1-mm1-clean/mm/sparse.c 2007-07-25 13:43:30.000000000 +0100
+++ linux-2.6.23-rc1-mm1-005-sh-sparsemem-fix/mm/sparse.c 2007-07-25 14:27:58.000000000 +0100
@@ -220,6 +220,35 @@ void *alloc_bootmem_high_node(pg_data_t
return NULL;
}
+static unsigned long usemap_size(void)
+{
+ unsigned long size_bytes;
+ size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
+ size_bytes = roundup(size_bytes, sizeof(unsigned long));
+ return size_bytes;
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static unsigned long *__kmalloc_section_usemap(void)
+{
+ return kmalloc(usemap_size(), GFP_KERNEL);
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+static unsigned long *sparse_early_usemap_alloc(unsigned long pnum)
+{
+ unsigned long *usemap;
+ struct mem_section *ms = __nr_to_section(pnum);
+ int nid = sparse_early_nid(ms);
+
+ usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
+ if (usemap)
+ return usemap;
+
+ printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__);
+ return NULL;
+}
+
#ifdef CONFIG_SPARSEMEM_VMEMMAP
/*
* Virtual Memory Map support
@@ -254,35 +283,6 @@ void *alloc_bootmem_high_node(pg_data_t
* require one PTE/TLB per PAGE_SIZE chunk of the virtual memory map.
*/
-static unsigned long usemap_size(void)
-{
- unsigned long size_bytes;
- size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
- size_bytes = roundup(size_bytes, sizeof(unsigned long));
- return size_bytes;
-}
-
-#ifdef CONFIG_MEMORY_HOTPLUG
-static unsigned long *__kmalloc_section_usemap(void)
-{
- return kmalloc(usemap_size(), GFP_KERNEL);
-}
-#endif /* CONFIG_MEMORY_HOTPLUG */
-
-static unsigned long *sparse_early_usemap_alloc(unsigned long pnum)
-{
- unsigned long *usemap;
- struct mem_section *ms = __nr_to_section(pnum);
- int nid = sparse_early_nid(ms);
-
- usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
- if (usemap)
- return usemap;
-
- printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__);
- return NULL;
-}
-
/*
* Allocate a block of memory to be used to back the virtual memory map
* or to back the page tables that are used to create the mapping.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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