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authorLv Zheng <lv.zheng@intel.com>2015-05-21 10:31:24 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-05-22 03:22:20 +0200
commit69ee810cbbca8d6834cdbbb31a8a00fa9ad91c47 (patch)
tree591d7cae72984b471c609557edfc586a7a0e35cb
parent0cff8dc0099f6d4f7431181918b37a472bcd1bbb (diff)
ACPICA: ACPI 6.0: Add ACPI_SUB_PTR().
ACPICA commit 5de82757aef5d6163e37064033aacbce193abbca Using a minus number with ACPI_ADD_PTR() will cause compiler warnings, such warnings cannot be eliminated by force casting an unsigned value to a signed value. This patch thus introduces ACPI_SUB_PTR() to be used with minus numbers. Lv Zheng. Link: https://github.com/acpica/acpica/commit/5de82757 Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--include/acpi/actypes.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index a9d33e8c33b7..63fd7f5e9fb3 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -525,6 +525,7 @@ typedef u64 acpi_integer;
#define ACPI_CAST_PTR(t, p) ((t *) (acpi_uintptr_t) (p))
#define ACPI_CAST_INDIRECT_PTR(t, p) ((t **) (acpi_uintptr_t) (p))
#define ACPI_ADD_PTR(t, a, b) ACPI_CAST_PTR (t, (ACPI_CAST_PTR (u8, (a)) + (acpi_size)(b)))
+#define ACPI_SUB_PTR(t, a, b) ACPI_CAST_PTR (t, (ACPI_CAST_PTR (u8, (a)) - (acpi_size)(b)))
#define ACPI_PTR_DIFF(a, b) (acpi_size) (ACPI_CAST_PTR (u8, (a)) - ACPI_CAST_PTR (u8, (b)))
/* Pointer/Integer type conversions */