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ACPI / CPPC: Use 64-bit arithmetic instead of 32-bit

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Add suffix ULL to constant 500 in order to give the compiler complete
information about the proper arithmetic to use. Notice that this
constant is used in a context that expects an expression of type
u64 (64 bits, unsigned).

The expression NUM_RETRIES * cppc_ss->latency at line 578, which at
preprocessing time translates to 500 * cppc_ss->latency is currently
being evaluated using 32-bit arithmetic.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Gustavo A. R. Silva 2018-02-06 17:36:17 -06:00 committed by Rafael J. Wysocki
parent 1a9a126b50
commit b52f451105
1 changed files with 1 additions and 1 deletions
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drivers/acpi/cppc_acpi.c
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@ -119,7 +119,7 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr);
* to PCC commands. Keeping it high enough to cover emulators where
* the processors run painfully slow.
*/
#define NUM_RETRIES 500
#define NUM_RETRIES 500ULL
struct cppc_attr {
struct attribute attr;