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view unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h @ 19675:97f2e7c576ab

PV-on-HVM: Define atomic_cmpxchg() for old Linux kernels.

Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue May 26 09:52:59 2009 +0100 (2009-05-26)
parents 11d12d61b138
children
line source
1 #ifndef COMPAT_INCLUDE_XEN_PLATFORM_COMPAT_H
2 #define COMPAT_INCLUDE_XEN_PLATFORM_COMPAT_H
4 #include <linux/version.h>
5 #include <linux/spinlock.h>
6 #include <asm/maddr.h>
8 #if defined(__LINUX_COMPILER_H) && !defined(__always_inline)
9 #define __always_inline inline
10 #endif
12 #if defined(__LINUX_SPINLOCK_H) && !defined(DEFINE_SPINLOCK)
13 #define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
14 #endif
16 #if defined(_LINUX_INIT_H) && !defined(__init)
17 #define __init
18 #endif
20 #if defined(__LINUX_CACHE_H) && !defined(__read_mostly)
21 #define __read_mostly
22 #endif
24 #if defined(_LINUX_SKBUFF_H) && !defined(NET_IP_ALIGN)
25 #define NET_IP_ALIGN 0
26 #endif
28 #if defined(_LINUX_SKBUFF_H) && !defined(CHECKSUM_HW)
29 #define CHECKSUM_HW CHECKSUM_PARTIAL
30 #endif
32 #if defined(_LINUX_ERR_H) && !defined(IS_ERR_VALUE)
33 #define IS_ERR_VALUE(x) unlikely((x) > (unsigned long)-1000L)
34 #endif
36 #if defined(_ASM_IA64_PGTABLE_H) && !defined(_PGTABLE_NOPUD_H)
37 #include <asm-generic/pgtable-nopud.h>
38 #endif
40 /* Some kernels have this typedef backported so we cannot reliably
41 * detect based on version number, hence we forcibly #define it.
42 */
43 #if defined(__LINUX_TYPES_H) || defined(__LINUX_GFP_H) || defined(_LINUX_KERNEL_H)
44 #define gfp_t unsigned
45 #endif
47 #if defined(_LINUX_NOTIFIER_H) && !defined(ATOMIC_NOTIFIER_HEAD)
48 #define ATOMIC_NOTIFIER_HEAD(name) struct notifier_block *name
49 #define atomic_notifier_chain_register(chain,nb) notifier_chain_register(chain,nb)
50 #define atomic_notifier_chain_unregister(chain,nb) notifier_chain_unregister(chain,nb)
51 #define atomic_notifier_call_chain(chain,val,v) notifier_call_chain(chain,val,v)
52 #endif
54 #if defined(_LINUX_NOTIFIER_H) && !defined(BLOCKING_NOTIFIER_HEAD)
55 #define BLOCKING_NOTIFIER_HEAD(name) struct notifier_block *name
56 #define blocking_notifier_chain_register(chain,nb) notifier_chain_register(chain,nb)
57 #define blocking_notifier_chain_unregister(chain,nb) notifier_chain_unregister(chain,nb)
58 #define blocking_notifier_call_chain(chain,val,v) notifier_call_chain(chain,val,v)
59 #endif
61 #if defined(_LINUX_MM_H) && defined set_page_count
62 #define init_page_count(page) set_page_count(page, 1)
63 #endif
65 #if defined(__LINUX_GFP_H) && !defined __GFP_NOMEMALLOC
66 #define __GFP_NOMEMALLOC 0
67 #endif
69 #if defined(_LINUX_FS_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9)
70 #define nonseekable_open(inode, filp) /* Nothing to do */
71 #endif
73 #if defined(_LINUX_MM_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10)
74 unsigned long vmalloc_to_pfn(void *addr);
75 #endif
77 #if defined(__LINUX_COMPLETION_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11)
78 unsigned long wait_for_completion_timeout(struct completion *x, unsigned long timeout);
79 #endif
81 #if defined(_LINUX_SCHED_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
82 signed long schedule_timeout_interruptible(signed long timeout);
83 #endif
85 #if defined(_LINUX_SLAB_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
86 void *kzalloc(size_t size, int flags);
87 #endif
89 #if defined(_LINUX_BLKDEV_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
90 #define end_that_request_last(req, uptodate) end_that_request_last(req)
91 #endif
93 #if defined(_LINUX_CAPABILITY_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
94 #define capable(cap) (1)
95 #endif
97 #if defined(_LINUX_KERNEL_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
98 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
99 __attribute__ ((format (printf, 2, 3)));
100 #endif
102 #if defined(_LINUX_SYSRQ_H) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
103 #define handle_sysrq(x,y,z) handle_sysrq(x,y)
104 #endif
106 #if defined(_PAGE_PRESENT) && !defined(_PAGE_NX)
107 #define _PAGE_NX 0
108 /*
109 * This variable at present is referenced by netfront, but only in code that
110 * is dead when running in hvm guests. To detect potential active uses of it
111 * in the future, don't try to supply a 'valid' value here, so that any
112 * mappings created with it will fault when accessed.
113 */
114 #define __supported_pte_mask ((maddr_t)0)
115 #endif
117 /* This code duplication is not ideal, but || does not seem to properly
118 * short circuit in a #if condition.
119 **/
120 #if defined(_LINUX_NETDEVICE_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
121 #if !defined(SLE_VERSION)
122 #define netif_tx_lock_bh(dev) spin_lock_bh(&(dev)->xmit_lock)
123 #define netif_tx_unlock_bh(dev) spin_unlock_bh(&(dev)->xmit_lock)
124 #elif SLE_VERSION_CODE < SLE_VERSION(10,1,0)
125 #define netif_tx_lock_bh(dev) spin_lock_bh(&(dev)->xmit_lock)
126 #define netif_tx_unlock_bh(dev) spin_unlock_bh(&(dev)->xmit_lock)
127 #endif
128 #endif
130 #if defined(__LINUX_SEQLOCK_H) && !defined(DEFINE_SEQLOCK)
131 #define DEFINE_SEQLOCK(x) seqlock_t x = SEQLOCK_UNLOCKED
132 #endif
134 /* Bug in RHEL4-U3: rw_lock_t is mistakenly defined in DEFINE_RWLOCK() macro */
135 #if defined(__LINUX_SPINLOCK_H) && defined(DEFINE_RWLOCK)
136 #define rw_lock_t rwlock_t
137 #endif
139 #if defined(__LINUX_SPINLOCK_H) && !defined(DEFINE_RWLOCK)
140 #define DEFINE_RWLOCK(x) rwlock_t x = RW_LOCK_UNLOCKED
141 #endif
143 #if defined(_LINUX_INTERRUPT_H) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
144 /**
145 * RHEL4-U5 pulled back this feature into the older kernel
146 * Since it is a typedef, and not a macro - detect this kernel via
147 * RHEL_VERSION
148 */
149 #if !defined(RHEL_VERSION) || (RHEL_VERSION == 4 && RHEL_UPDATE < 5)
150 #if !defined(RHEL_MAJOR) || (RHEL_MAJOR == 4 && RHEL_MINOR < 5)
151 typedef irqreturn_t (*irq_handler_t)(int, void *, struct pt_regs *);
152 #endif
153 #endif
154 #endif
156 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
157 #define setup_xen_features xen_setup_features
158 #endif
160 #ifndef atomic_cmpxchg
161 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
162 #endif
164 #endif