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ACPICA: Avoid NULL pointer arithmetic

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We should not assume NULL is defined as "(void *)0" because NULL is
an implementation-defined macro.  Especially, Clang 6 complains about
it, i.e., "arithmetic on a null pointer treated as a cast from integer
to pointer is a GNU extension".

Signed-off-by: Jung-uk Kim <jkim@free_BSD.org>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jung-uk Kim 2018-01-24 15:42:30 -08:00 committed by Rafael J. Wysocki
parent 0eedae8e5f
commit 761f0b8239
1 changed files with 4 additions and 4 deletions
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8
include/acpi/actypes.h
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@ -485,7 +485,7 @@ typedef u8 acpi_owner_id;
/*
* Constants with special meanings
*/
#define ACPI_ROOT_OBJECT ACPI_ADD_PTR (acpi_handle, NULL, ACPI_MAX_PTR)
#define ACPI_ROOT_OBJECT ACPI_ADD_PTR (acpi_handle, (void *) 0, ACPI_MAX_PTR)
#define ACPI_WAIT_FOREVER 0xFFFF /* u16, as per ACPI spec */
#define ACPI_DO_NOT_WAIT 0
@ -536,9 +536,9 @@ typedef u64 acpi_integer;
/* Pointer/Integer type conversions */
#define ACPI_TO_POINTER(i) ACPI_ADD_PTR (void, (void *) NULL,(acpi_size) i)
#define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) NULL)
#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) NULL)
#define ACPI_TO_POINTER(i) ACPI_ADD_PTR (void, (void *) 0, (acpi_size) (i))
#define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) 0)
#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) 0)
#define ACPI_PHYSADDR_TO_PTR(i) ACPI_TO_POINTER(i)
#define ACPI_PTR_TO_PHYSADDR(i) ACPI_TO_INTEGER(i)