ia64/linux-2.6.18-xen.hg

view include/asm-i386/local.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 #ifndef _ARCH_I386_LOCAL_H
2 #define _ARCH_I386_LOCAL_H
4 #include <linux/percpu.h>
6 typedef struct
7 {
8 volatile long counter;
9 } local_t;
11 #define LOCAL_INIT(i) { (i) }
13 #define local_read(v) ((v)->counter)
14 #define local_set(v,i) (((v)->counter) = (i))
16 static __inline__ void local_inc(local_t *v)
17 {
18 __asm__ __volatile__(
19 "incl %0"
20 :"+m" (v->counter));
21 }
23 static __inline__ void local_dec(local_t *v)
24 {
25 __asm__ __volatile__(
26 "decl %0"
27 :"+m" (v->counter));
28 }
30 static __inline__ void local_add(long i, local_t *v)
31 {
32 __asm__ __volatile__(
33 "addl %1,%0"
34 :"+m" (v->counter)
35 :"ir" (i));
36 }
38 static __inline__ void local_sub(long i, local_t *v)
39 {
40 __asm__ __volatile__(
41 "subl %1,%0"
42 :"+m" (v->counter)
43 :"ir" (i));
44 }
46 /* On x86, these are no better than the atomic variants. */
47 #define __local_inc(l) local_inc(l)
48 #define __local_dec(l) local_dec(l)
49 #define __local_add(i,l) local_add((i),(l))
50 #define __local_sub(i,l) local_sub((i),(l))
52 /* Use these for per-cpu local_t variables: on some archs they are
53 * much more efficient than these naive implementations. Note they take
54 * a variable, not an address.
55 */
57 /* Need to disable preemption for the cpu local counters otherwise we could
58 still access a variable of a previous CPU in a non atomic way. */
59 #define cpu_local_wrap_v(v) \
60 ({ local_t res__; \
61 preempt_disable(); \
62 res__ = (v); \
63 preempt_enable(); \
64 res__; })
65 #define cpu_local_wrap(v) \
66 ({ preempt_disable(); \
67 v; \
68 preempt_enable(); }) \
70 #define cpu_local_read(v) cpu_local_wrap_v(local_read(&__get_cpu_var(v)))
71 #define cpu_local_set(v, i) cpu_local_wrap(local_set(&__get_cpu_var(v), (i)))
72 #define cpu_local_inc(v) cpu_local_wrap(local_inc(&__get_cpu_var(v)))
73 #define cpu_local_dec(v) cpu_local_wrap(local_dec(&__get_cpu_var(v)))
74 #define cpu_local_add(i, v) cpu_local_wrap(local_add((i), &__get_cpu_var(v)))
75 #define cpu_local_sub(i, v) cpu_local_wrap(local_sub((i), &__get_cpu_var(v)))
77 #define __cpu_local_inc(v) cpu_local_inc(v)
78 #define __cpu_local_dec(v) cpu_local_dec(v)
79 #define __cpu_local_add(i, v) cpu_local_add((i), (v))
80 #define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
82 #endif /* _ARCH_I386_LOCAL_H */