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PV-on-HVM: Define DEFINE_RWLOCK() macro for older Linux kernels.
Signed-off-by: Ben Guthro <bguthro@virtualron.com>
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kfraser@localhost.localdomain committed
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@@ -116,4 +116,13 @@ extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
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#define DEFINE_SEQLOCK(x) seqlock_t x = SEQLOCK_UNLOCKED
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#endif
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/* Bug in RHEL4-U3: rw_lock_t is mistakenly defined in DEFINE_RWLOCK() macro */
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#if defined(__LINUX_SPINLOCK_H) && defined(DEFINE_RWLOCK)
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#define rw_lock_t rwlock_t
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#endif
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#if defined(__LINUX_SPINLOCK_H) && !defined(DEFINE_RWLOCK)
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#define DEFINE_RWLOCK(x) rwlock_t x = RW_LOCK_UNLOCKED
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#endif
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#endif
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