Pull acpica into release branch

1 files changed, 55 insertions, 16 deletions

diff --git a/drivers/acpi/executer/exfldio.c b/drivers/acpi/executer/exfldio.c
index 051053f7cccb..40f0bee6faa5 100644
--- a/drivers/acpi/executer/exfldio.c
+++ b/drivers/acpi/executer/exfldio.c
@@ -727,11 +727,23 @@ acpi_ex_extract_from_field(union acpi_operand_object *obj_desc,
                         return_ACPI_STATUS(status);
                 }
 
-                /* Merge with previous datum if necessary */
-
-                merged_datum |= raw_datum <<
-                    (obj_desc->common_field.access_bit_width -
-                     obj_desc->common_field.start_field_bit_offset);
+                /*
+                 * Merge with previous datum if necessary.
+                 *
+                 * Note: Before the shift, check if the shift value will be larger than
+                 * the integer size. If so, there is no need to perform the operation.
+                 * This avoids the differences in behavior between different compilers
+                 * concerning shift values larger than the target data width.
+                 */
+                if ((obj_desc->common_field.access_bit_width -
+                     obj_desc->common_field.start_field_bit_offset) <
+                    ACPI_INTEGER_BIT_SIZE) {
+                        merged_datum |=
+                            raw_datum << (obj_desc->common_field.
+                                          access_bit_width -
+                                          obj_desc->common_field.
+                                          start_field_bit_offset);
+                }
 
                 if (i == datum_count) {
                         break;
@@ -808,13 +820,23 @@ acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
                 return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
         }
 
-        /* Compute the number of datums (access width data items) */
+        /*
+         * Create the bitmasks used for bit insertion.
+         * Note: This if/else is used to bypass compiler differences with the
+         * shift operator
+         */
+        if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
+                width_mask = ACPI_INTEGER_MAX;
+        } else {
+                width_mask =
+                    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
+                                         access_bit_width);
+        }
 
-        width_mask =
-            ACPI_MASK_BITS_ABOVE(obj_desc->common_field.access_bit_width);
-        mask =
-            width_mask & ACPI_MASK_BITS_BELOW(obj_desc->common_field.
-                                              start_field_bit_offset);
+        mask = width_mask &
+            ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
+
+        /* Compute the number of datums (access width data items) */
 
         datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
                                        obj_desc->common_field.access_bit_width);
@@ -848,12 +870,29 @@ acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
                         return_ACPI_STATUS(status);
                 }
 
-                /* Start new output datum by merging with previous input datum */
-
                 field_offset += obj_desc->common_field.access_byte_width;
-                merged_datum = raw_datum >>
-                    (obj_desc->common_field.access_bit_width -
-                     obj_desc->common_field.start_field_bit_offset);
+
+                /*
+                 * Start new output datum by merging with previous input datum
+                 * if necessary.
+                 *
+                 * Note: Before the shift, check if the shift value will be larger than
+                 * the integer size. If so, there is no need to perform the operation.
+                 * This avoids the differences in behavior between different compilers
+                 * concerning shift values larger than the target data width.
+                 */
+                if ((obj_desc->common_field.access_bit_width -
+                     obj_desc->common_field.start_field_bit_offset) <
+                    ACPI_INTEGER_BIT_SIZE) {
+                        merged_datum =
+                            raw_datum >> (obj_desc->common_field.
+                                          access_bit_width -
+                                          obj_desc->common_field.
+                                          start_field_bit_offset);
+                } else {
+                        merged_datum = 0;
+                }
+
                 mask = width_mask;
 
                 if (i == datum_count) {