[PATCH 13/19] ACPICA: ACPI 6.0: Add ACPI_SUB_PTR().

[Lv Zheng]

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@xxxxxxxxx>
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
---
 include/acpi/actypes.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index a9d33e8..63fd7f5 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 */
-- 
1.7.10

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