1 files changed, 22 insertions, 0 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index c8f96cff07c6..094300b3a81f 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -1327,3 +1327,25 @@ static int __init setup_acpi_sci(char *s)
         return 0;
 }
 early_param("acpi_sci", setup_acpi_sci);
+
+int __acpi_acquire_global_lock(unsigned int *lock)
+{
+        unsigned int old, new, val;
+        do {
+                old = *lock;
+                new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
+                val = cmpxchg(lock, old, new);
+        } while (unlikely (val != old));
+        return (new < 3) ? -1 : 0;
+}
+
+int __acpi_release_global_lock(unsigned int *lock)
+{
+        unsigned int old, new, val;
+        do {
+                old = *lock;
+                new = old & ~0x3;
+                val = cmpxchg(lock, old, new);
+        } while (unlikely (val != old));
+        return old & 0x1;
+}