2015-07-10 15:21:29 +00:00
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# Commit f9cc3cd9b4de58cf032c8624406384c172937e57
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# Date 2015-05-08 10:59:44 +0200
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# Author David Vrabel <david.vrabel@citrix.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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arm: provide arch_fetch_and_add()
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arch_fetch_and_add() atomically adds a value and returns the previous
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value.
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This generic arm implementation uses the GCC __sync_fetch_and_add()
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builtin. This builtin resulted in suitable inlined asm for GCC 4.8.3
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(arm64) and GCC 4.6.3 (arm32).
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This is needed to implement ticket locks.
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Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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Acked-by: Ian Campbell <ian.campbell@citrix.com>
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2015-08-26 22:28:15 +00:00
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--- a/xen/include/asm-arm/system.h
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+++ b/xen/include/asm-arm/system.h
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2015-07-10 15:21:29 +00:00
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@@ -51,6 +51,8 @@
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# error "unknown ARM variant"
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#endif
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+#define arch_fetch_and_add(x, v) __sync_fetch_and_add(x, v)
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+
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extern struct vcpu *__context_switch(struct vcpu *prev, struct vcpu *next);
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#endif
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