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-rw-r--r--arch/i386/kernel/acpi/boot.c22
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)
1327 return 0; 1327 return 0;
1328} 1328}
1329early_param("acpi_sci", setup_acpi_sci); 1329early_param("acpi_sci", setup_acpi_sci);
1330
1331int __acpi_acquire_global_lock(unsigned int *lock)
1332{
1333 unsigned int old, new, val;
1334 do {
1335 old = *lock;
1336 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1337 val = cmpxchg(lock, old, new);
1338 } while (unlikely (val != old));
1339 return (new < 3) ? -1 : 0;
1340}
1341
1342int __acpi_release_global_lock(unsigned int *lock)
1343{
1344 unsigned int old, new, val;
1345 do {
1346 old = *lock;
1347 new = old & ~0x3;
1348 val = cmpxchg(lock, old, new);
1349 } while (unlikely (val != old));
1350 return old & 0x1;
1351}