linux/include/asm-i386/mmzone.h
Andy Whitcroft 4af2bfc120 [PATCH] silence unused pgdat warning from alloc_bootmem_node and friends
x86 NUMA systems only define bootmem for node 0.  alloc_bootmem_node() and
friends therefore ignore the passed pgdat and use NODE_DATA(0) in all
cases.  This leads to the following warnings as we are not using the passed
parameter:

  .../mm/page_alloc.c: In function 'zone_wait_table_init':
  .../mm/page_alloc.c:2259: warning: unused variable 'pgdat'

One option would be to define all variables used with these macros
__attribute__ ((unused)), but this would leave us exposed should these
become genuinely unused.

The key here is that we _are_ using the value, we ignore it but that is a
deliberate action.  This patch adds a nested local variable within the
alloc_bootmem_node helper to which the pgdat parameter is assigned making
it 'used'.  The nested local is marked __attribute__ ((unused)) to silence
this same warning for it.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07 08:39:23 -08:00

145 lines
3.6 KiB
C

/*
* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
*
*/
#ifndef _ASM_MMZONE_H_
#define _ASM_MMZONE_H_
#include <asm/smp.h>
#ifdef CONFIG_NUMA
extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
#ifdef CONFIG_X86_NUMAQ
#include <asm/numaq.h>
#elif defined(CONFIG_ACPI_SRAT)/* summit or generic arch */
#include <asm/srat.h>
#endif
extern int get_memcfg_numa_flat(void );
/*
* This allows any one NUMA architecture to be compiled
* for, and still fall back to the flat function if it
* fails.
*/
static inline void get_memcfg_numa(void)
{
#ifdef CONFIG_X86_NUMAQ
if (get_memcfg_numaq())
return;
#elif defined(CONFIG_ACPI_SRAT)
if (get_memcfg_from_srat())
return;
#endif
get_memcfg_numa_flat();
}
extern int early_pfn_to_nid(unsigned long pfn);
extern void numa_kva_reserve(void);
#else /* !CONFIG_NUMA */
#define get_memcfg_numa get_memcfg_numa_flat
#define get_zholes_size(n) (0)
static inline void numa_kva_reserve(void)
{
}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DISCONTIGMEM
/*
* generic node memory support, the following assumptions apply:
*
* 1) memory comes in 256Mb contigious chunks which are either present or not
* 2) we will not have more than 64Gb in total
*
* for now assume that 64Gb is max amount of RAM for whole system
* 64Gb / 4096bytes/page = 16777216 pages
*/
#define MAX_NR_PAGES 16777216
#define MAX_ELEMENTS 256
#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
extern s8 physnode_map[];
static inline int pfn_to_nid(unsigned long pfn)
{
#ifdef CONFIG_NUMA
return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
#else
return 0;
#endif
}
/*
* Following are macros that each numa implmentation must define.
*/
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) \
({ \
pg_data_t *__pgdat = NODE_DATA(nid); \
__pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
})
/* XXX: FIXME -- wli */
#define kern_addr_valid(kaddr) (0)
#ifdef CONFIG_X86_NUMAQ /* we have contiguous memory on NUMA-Q */
#define pfn_valid(pfn) ((pfn) < num_physpages)
#else
static inline int pfn_valid(int pfn)
{
int nid = pfn_to_nid(pfn);
if (nid >= 0)
return (pfn < node_end_pfn(nid));
return 0;
}
#endif /* CONFIG_X86_NUMAQ */
#endif /* CONFIG_DISCONTIGMEM */
#ifdef CONFIG_NEED_MULTIPLE_NODES
/*
* Following are macros that are specific to this numa platform.
*/
#define reserve_bootmem(addr, size) \
reserve_bootmem_node(NODE_DATA(0), (addr), (size))
#define alloc_bootmem(x) \
__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low(x) \
__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
#define alloc_bootmem_pages(x) \
__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low_pages(x) \
__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
#define alloc_bootmem_node(pgdat, x) \
({ \
struct pglist_data __attribute__ ((unused)) \
*__alloc_bootmem_node__pgdat = (pgdat); \
__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, \
__pa(MAX_DMA_ADDRESS)); \
})
#define alloc_bootmem_pages_node(pgdat, x) \
({ \
struct pglist_data __attribute__ ((unused)) \
*__alloc_bootmem_node__pgdat = (pgdat); \
__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, \
__pa(MAX_DMA_ADDRESS)) \
})
#define alloc_bootmem_low_pages_node(pgdat, x) \
({ \
struct pglist_data __attribute__ ((unused)) \
*__alloc_bootmem_node__pgdat = (pgdat); \
__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0); \
})
#endif /* CONFIG_NEED_MULTIPLE_NODES */
#endif /* _ASM_MMZONE_H_ */