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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-01-17 11:46:24 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-01-23 00:37:02 +0100 |
| commit | 86e9466ae620824dee861f0f6ed933fcd0b449f3 (patch) | |
| tree | 43b210a9685b68e5b9d13846f57ecd399a683d64 /drivers/idle | |
| parent | 1aefbd7aeb7695c1a9e6ece9a1612ee88e1ea3f8 (diff) | |
| download | linux-86e9466ae620824dee861f0f6ed933fcd0b449f3.tar.bz2 | |
intel_idle: Clean up irtl_2_usec()
Move the irtl_ns_units[] definition into irtl_2_usec() which is the
only user of it, use div_u64() for the division in there (as the
divisor is small enough) and use the NSEC_PER_USEC symbol for the
divisor. Also convert the irtl_2_usec() comment to a proper
kerneldo one.
No intentional functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | drivers/idle/intel_idle.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 27c50fba26d5..9f38ff02a7b8 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1292,16 +1292,17 @@ static void __init ivt_idle_state_table_update(void) /* else, 1 and 2 socket systems use default ivt_cstates */ } -/* - * Translate IRTL (Interrupt Response Time Limit) MSR to usec +/** + * irtl_2_usec - IRTL to microseconds conversion. + * @irtl: IRTL MSR value. + * + * Translate the IRTL (Interrupt Response Time Limit) MSR value to microseconds. */ - -static const unsigned int irtl_ns_units[] __initconst = { - 1, 32, 1024, 32768, 1048576, 33554432, 0, 0 -}; - static unsigned long long __init irtl_2_usec(unsigned long long irtl) { + static const unsigned int irtl_ns_units[] __initconst = { + 1, 32, 1024, 32768, 1048576, 33554432, 0, 0 + }; unsigned long long ns; if (!irtl) @@ -1309,8 +1310,9 @@ static unsigned long long __init irtl_2_usec(unsigned long long irtl) ns = irtl_ns_units[(irtl >> 10) & 0x7]; - return div64_u64((irtl & 0x3FF) * ns, 1000); + return div_u64((irtl & 0x3FF) * ns, NSEC_PER_USEC); } + /* * bxt_idle_state_table_update(void) * |