ACPICA: Use local 64-bit divide support for string conversions

ACPICA commit f230f4df26d07b97ef00be39156ecee64250447d

On 32-bit platforms, 64-bit divide often requires a library
function which may not be present in the build.

Link: https://github.com/acpica/acpica/commit/f230f4df
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/utstrsuppt.c b/drivers/acpi/acpica/utstrsuppt.c
index 965fb5c..b2fc371 100644 (file)
--- a/drivers/acpi/acpica/utstrsuppt.c
+++ b/drivers/acpi/acpica/utstrsuppt.c
@@ -52,10 +52,9 @@ static acpi_status
 acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit);
 
 static acpi_status
-acpi_ut_strtoul_multiply64(u64 multiplicand, u64 multiplier, u64 *out_product);
+acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product);
 
-static acpi_status
-acpi_ut_strtoul_add64(u64 addend1, u64 addend2, u64 *out_sum);
+static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum);
 
 /*******************************************************************************
  *
@@ -357,7 +356,7 @@ acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit)
  * FUNCTION:    acpi_ut_strtoul_multiply64
  *
  * PARAMETERS:  multiplicand            - Current accumulated converted integer
- *              multiplier              - Base/Radix
+ *              base                    - Base/Radix
  *              out_product             - Where the product is returned
  *
  * RETURN:      Status and 64-bit product
@@ -369,25 +368,32 @@ acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit)
  ******************************************************************************/
 
 static acpi_status
-acpi_ut_strtoul_multiply64(u64 multiplicand, u64 multiplier, u64 *out_product)
+acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product)
 {
        u64 val;
+       u64 quotient;
 
        /* Exit if either operand is zero */
 
        *out_product = 0;
-       if (!multiplicand || !multiplier) {
+       if (!multiplicand || !base) {
                return (AE_OK);
        }
 
-       /* Check for 64-bit overflow before the actual multiplication */
-
-       acpi_ut_short_divide(ACPI_UINT64_MAX, (u32)multiplier, &val, NULL);
-       if (multiplicand > val) {
+       /*
+        * Check for 64-bit overflow before the actual multiplication.
+        *
+        * Notes: 64-bit division is often not supported on 32-bit platforms
+        * (it requires a library function), Therefore ACPICA has a local
+        * 64-bit divide function. Also, Multiplier is currently only used
+        * as the radix (8/10/16), to the 64/32 divide will always work.
+        */
+       acpi_ut_short_divide(ACPI_UINT64_MAX, base, &quotient, NULL);
+       if (multiplicand > quotient) {
                return (AE_NUMERIC_OVERFLOW);
        }
 
-       val = multiplicand * multiplier;
+       val = multiplicand * base;
 
        /* Check for 32-bit overflow if necessary */
 
@@ -404,7 +410,7 @@ acpi_ut_strtoul_multiply64(u64 multiplicand, u64 multiplier, u64 *out_product)
  * FUNCTION:    acpi_ut_strtoul_add64
  *
  * PARAMETERS:  addend1                 - Current accumulated converted integer
- *              addend2                 - New hex value/char
+ *              digit                   - New hex value/char
  *              out_sum                 - Where sum is returned (Accumulator)
  *
  * RETURN:      Status and 64-bit sum
@@ -415,17 +421,17 @@ acpi_ut_strtoul_multiply64(u64 multiplicand, u64 multiplier, u64 *out_product)
  *
  ******************************************************************************/
 
-static acpi_status acpi_ut_strtoul_add64(u64 addend1, u64 addend2, u64 *out_sum)
+static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum)
 {
        u64 sum;
 
        /* Check for 64-bit overflow before the actual addition */
 
-       if ((addend1 > 0) && (addend2 > (ACPI_UINT64_MAX - addend1))) {
+       if ((addend1 > 0) && (digit > (ACPI_UINT64_MAX - addend1))) {
                return (AE_NUMERIC_OVERFLOW);
        }
 
-       sum = addend1 + addend2;
+       sum = addend1 + digit;
 
        /* Check for 32-bit overflow if necessary */