Commit b5a0e011 authored by Alexander van Heukelum's avatar Alexander van Heukelum Committed by Linus Torvalds

Solve section mismatch for free_area_init_core.

WARNING: vmlinux.o(.meminit.text+0x649):
Section mismatch in reference from the
function free_area_init_core() to the function .init.text:setup_usemap()
The function __meminit free_area_init_core() references
a function __init setup_usemap().
If free_area_init_core is only used by setup_usemap then
annotate free_area_init_core with a matching annotation.

The warning is covers this stack of functions in mm/page_alloc.c:

alloc_bootmem_node must be marked __init.
alloc_bootmem_node is used by setup_usemap, if !SPARSEMEM.
(usemap_size is only used by setup_usemap, if !SPARSEMEM.)
setup_usemap is only used by free_area_init_core.
free_area_init_core is only used by free_area_init_node.

free_area_init_node is used by:
arch/alpha/mm/numa.c: __init paging_init()
arch/arm/mm/init.c: __init bootmem_init_node()
arch/avr32/mm/init.c: __init paging_init()
arch/cris/arch-v10/mm/init.c: __init paging_init()
arch/cris/arch-v32/mm/init.c: __init paging_init()
arch/m32r/mm/discontig.c: __init zone_sizes_init()
arch/m32r/mm/init.c: __init zone_sizes_init()
arch/m68k/mm/motorola.c: __init paging_init()
arch/m68k/mm/sun3mmu.c: __init paging_init()
arch/mips/sgi-ip27/ip27-memory.c: __init paging_init()
arch/parisc/mm/init.c: __init paging_init()
arch/sparc/mm/srmmu.c: __init srmmu_paging_init()
arch/sparc/mm/sun4c.c: __init sun4c_paging_init()
arch/sparc64/mm/init.c: __init paging_init()
mm/page_alloc.c: __init free_area_init_nodes()
mm/page_alloc.c: __init free_area_init()
and
mm/memory_hotplug.c: hotadd_new_pgdat()

hotadd_new_pgdat can not be an __init function, but:

It is compiled for MEMORY_HOTPLUG configurations only
MEMORY_HOTPLUG depends on SPARSEMEM || X86_64_ACPI_NUMA
X86_64_ACPI_NUMA depends on X86_64
ARCH_FLATMEM_ENABLE depends on X86_32
ARCH_DISCONTIGMEM_ENABLE depends on X86_32
So X86_64_ACPI_NUMA implies SPARSEMEM, right?

So we can mark the stack of functions __init for !SPARSEMEM, but we must mark
them __meminit for SPARSEMEM configurations.  This is ok, because then the
calls to alloc_bootmem_node are also avoided.

Compile-tested on:
silly minimal config
defconfig x86_32
defconfig x86_64
defconfig x86_64 -HIBERNATION +MEMORY_HOTPLUG
Signed-off-by: default avatarAlexander van Heukelum <heukelum@fastmail.fm>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bcdca225
...@@ -47,4 +47,17 @@ static inline unsigned long page_order(struct page *page) ...@@ -47,4 +47,17 @@ static inline unsigned long page_order(struct page *page)
VM_BUG_ON(!PageBuddy(page)); VM_BUG_ON(!PageBuddy(page));
return page_private(page); return page_private(page);
} }
/*
* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
* so all functions starting at paging_init should be marked __init
* in those cases. SPARSEMEM, however, allows for memory hotplug,
* and alloc_bootmem_node is not used.
*/
#ifdef CONFIG_SPARSEMEM
#define __paginginit __meminit
#else
#define __paginginit __init
#endif
#endif #endif
...@@ -3314,7 +3314,7 @@ static inline int pageblock_default_order(unsigned int order) ...@@ -3314,7 +3314,7 @@ static inline int pageblock_default_order(unsigned int order)
* - mark all memory queues empty * - mark all memory queues empty
* - clear the memory bitmaps * - clear the memory bitmaps
*/ */
static void __meminit free_area_init_core(struct pglist_data *pgdat, static void __paginginit free_area_init_core(struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long *zholes_size) unsigned long *zones_size, unsigned long *zholes_size)
{ {
enum zone_type j; enum zone_type j;
...@@ -3438,7 +3438,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) ...@@ -3438,7 +3438,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
#endif /* CONFIG_FLAT_NODE_MEM_MAP */ #endif /* CONFIG_FLAT_NODE_MEM_MAP */
} }
void __meminit free_area_init_node(int nid, struct pglist_data *pgdat, void __paginginit free_area_init_node(int nid, struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long node_start_pfn, unsigned long *zones_size, unsigned long node_start_pfn,
unsigned long *zholes_size) unsigned long *zholes_size)
{ {
......
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