ia64/xen-unstable

view xen/include/asm-ia64/linux-xen/linux/gfp.h @ 9770:ced37bea0647

[IA64] FPH enabling + cleanup

Move contents of switch_to macro from xensystem.h to context_switch function.
Initialize FPU on all processors. FPH is always enabled in Xen.
Speed up context-switch (a little bit!) by not enabling/disabling FPH.
Cleanup (unused function/variablesi/fields, debug printf...)
vmx_ia64_switch_to removed (was unused).

Signed-off-by: Tristan Gingold <tristan.gingold@bull.net>
author awilliam@xenbuild.aw
date Tue Apr 25 22:35:41 2006 -0600 (2006-04-25)
parents 1055f276cc4d
children
line source
1 #ifndef __LINUX_GFP_H
2 #define __LINUX_GFP_H
4 #ifdef XEN
5 #include <asm/bitops.h>
6 #include <linux/topology.h>
7 #endif
8 #include <linux/mmzone.h>
9 #include <linux/stddef.h>
10 #include <linux/linkage.h>
11 #include <linux/config.h>
13 struct vm_area_struct;
15 /*
16 * GFP bitmasks..
17 */
18 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
19 #define __GFP_DMA 0x01u
20 #define __GFP_HIGHMEM 0x02u
22 /*
23 * Action modifiers - doesn't change the zoning
24 *
25 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
26 * _might_ fail. This depends upon the particular VM implementation.
27 *
28 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
29 * cannot handle allocation failures.
30 *
31 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
32 */
33 #define __GFP_WAIT 0x10u /* Can wait and reschedule? */
34 #define __GFP_HIGH 0x20u /* Should access emergency pools? */
35 #define __GFP_IO 0x40u /* Can start physical IO? */
36 #define __GFP_FS 0x80u /* Can call down to low-level FS? */
37 #define __GFP_COLD 0x100u /* Cache-cold page required */
38 #define __GFP_NOWARN 0x200u /* Suppress page allocation failure warning */
39 #define __GFP_REPEAT 0x400u /* Retry the allocation. Might fail */
40 #define __GFP_NOFAIL 0x800u /* Retry for ever. Cannot fail */
41 #define __GFP_NORETRY 0x1000u /* Do not retry. Might fail */
42 #define __GFP_NO_GROW 0x2000u /* Slab internal usage */
43 #define __GFP_COMP 0x4000u /* Add compound page metadata */
44 #define __GFP_ZERO 0x8000u /* Return zeroed page on success */
45 #define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */
46 #define __GFP_NORECLAIM 0x20000u /* No realy zone reclaim during allocation */
48 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
49 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
51 /* if you forget to add the bitmask here kernel will crash, period */
52 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
53 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
54 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
55 __GFP_NOMEMALLOC|__GFP_NORECLAIM)
57 #define GFP_ATOMIC (__GFP_HIGH)
58 #define GFP_NOIO (__GFP_WAIT)
59 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
60 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
61 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS)
62 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM)
64 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
65 platforms, used as appropriate on others */
67 #define GFP_DMA __GFP_DMA
70 /*
71 * There is only one page-allocator function, and two main namespaces to
72 * it. The alloc_page*() variants return 'struct page *' and as such
73 * can allocate highmem pages, the *get*page*() variants return
74 * virtual kernel addresses to the allocated page(s).
75 */
77 /*
78 * We get the zone list from the current node and the gfp_mask.
79 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
80 *
81 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
82 * optimized to &contig_page_data at compile-time.
83 */
85 #ifndef XEN
86 #ifndef HAVE_ARCH_FREE_PAGE
87 static inline void arch_free_page(struct page *page, int order) { }
88 #endif
90 extern struct page *
91 FASTCALL(__alloc_pages(unsigned int, unsigned int, struct zonelist *));
93 static inline struct page *alloc_pages_node(int nid, unsigned int __nocast gfp_mask,
94 unsigned int order)
95 {
96 if (unlikely(order >= MAX_ORDER))
97 return NULL;
99 return __alloc_pages(gfp_mask, order,
100 NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
101 }
103 #ifdef CONFIG_NUMA
104 extern struct page *alloc_pages_current(unsigned int __nocast gfp_mask, unsigned order);
106 static inline struct page *
107 alloc_pages(unsigned int __nocast gfp_mask, unsigned int order)
108 {
109 if (unlikely(order >= MAX_ORDER))
110 return NULL;
112 return alloc_pages_current(gfp_mask, order);
113 }
114 extern struct page *alloc_page_vma(unsigned __nocast gfp_mask,
115 struct vm_area_struct *vma, unsigned long addr);
116 #else
117 #define alloc_pages(gfp_mask, order) \
118 alloc_pages_node(numa_node_id(), gfp_mask, order)
119 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
120 #endif
121 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
123 extern unsigned long FASTCALL(__get_free_pages(unsigned int __nocast gfp_mask, unsigned int order));
124 extern unsigned long FASTCALL(get_zeroed_page(unsigned int __nocast gfp_mask));
126 #define __get_free_page(gfp_mask) \
127 __get_free_pages((gfp_mask),0)
129 #define __get_dma_pages(gfp_mask, order) \
130 __get_free_pages((gfp_mask) | GFP_DMA,(order))
132 extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
133 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
134 extern void FASTCALL(free_hot_page(struct page *page));
135 extern void FASTCALL(free_cold_page(struct page *page));
137 #define __free_page(page) __free_pages((page), 0)
138 #define free_page(addr) free_pages((addr),0)
139 #endif /* XEN */
141 void page_alloc_init(void);
142 #ifdef CONFIG_NUMA
143 void drain_remote_pages(void);
144 #else
145 static inline void drain_remote_pages(void) { };
146 #endif
148 #endif /* __LINUX_GFP_H */