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authorLinus Torvalds <torvalds@woody.osdl.org>2006-12-22 18:46:56 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-22 18:46:56 -0800
commit18ed1c051317ac3a685120cead2adb192b802347 (patch)
treec08a9147119a6cb69114166c7107f6b0bba6e2ab /arch/i386/kernel
parentdab6df63086762629936e8b89a5984bae39724f6 (diff)
parent36bcbec7ce21e2e8b3143b11a05747330abeca70 (diff)
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (68 commits) ACPI: replace kmalloc+memset with kzalloc ACPI: Add support for acpi_load_table/acpi_unload_table_id fbdev: update after backlight argument change ACPI: video: Add dev argument for backlight_device_register ACPI: Implement acpi_video_get_next_level() ACPI: Kconfig - depend on PM rather than selecting it ACPI: fix NULL check in drivers/acpi/osl.c ACPI: make drivers/acpi/ec.c:ec_ecdt static ACPI: prevent processor module from loading on failures ACPI: fix single linked list manipulation ACPI: ibm_acpi: allow clean removal ACPI: fix git automerge failure ACPI: ibm_acpi: respond to workqueue update ACPI: dock: add uevent to indicate change in device status ACPI: ec: Lindent once again ACPI: ec: Change #define to enums there possible. ACPI: ec: Style changes. ACPI: ec: Acquire Global Lock under EC mutex. ACPI: ec: Drop udelay() from poll mode. Loop by reading status field instead. ACPI: ec: Rename gpe_bit to gpe ...
Diffstat (limited to 'arch/i386/kernel')
-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)
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;
+}