[xen staging] x86/mwait: remove unneeded local variables

[patchbot@xxxxxxx]

commit f36f4bf582d353d8424154b14b663b075a0276e3
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Jul 14 09:57:17 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 14 09:57:17 2020 +0200

    x86/mwait: remove unneeded local variables
    
    Remove the eax and cstate local variables, the same can be directly
    fetched from acpi_processor_cx without any transformations.
    
    No functional change.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/mwait-idle.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index 52eab81bf8..8add13d698 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -721,7 +721,7 @@ static void mwait_idle(void)
        unsigned int cpu = smp_processor_id();
        struct acpi_processor_power *power = processor_powers[cpu];
        struct acpi_processor_cx *cx = NULL;
-       unsigned int eax, next_state, cstate;
+       unsigned int next_state;
        u64 before, after;
        u32 exp = 0, pred = 0, irq_traced[4] = { 0 };
 
@@ -773,9 +773,6 @@ static void mwait_idle(void)
        if ((cx->type >= 3) && errata_c6_workaround())
                cx = power->safe_state;
 
-       eax = cx->address;
-       cstate = ((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
-
 #if 0 /* XXX Can we/do we need to do something similar on Xen? */
        /*
         * leave_mm() to avoid costly and often unnecessary wakeups
@@ -785,7 +782,7 @@ static void mwait_idle(void)
                leave_mm(cpu);
 #endif
 
-       if (!(lapic_timer_reliable_states & (1 << cstate)))
+       if (!(lapic_timer_reliable_states & (1 << cx->type)))
                lapic_timer_off();
 
        before = alternative_call(cpuidle_get_tick);
@@ -794,7 +791,7 @@ static void mwait_idle(void)
        update_last_cx_stat(power, cx, before);
 
        if (cpu_is_haltable(cpu))
-               mwait_idle_with_hints(eax, MWAIT_ECX_INTERRUPT_BREAK);
+               mwait_idle_with_hints(cx->address, MWAIT_ECX_INTERRUPT_BREAK);
 
        after = alternative_call(cpuidle_get_tick);
 
@@ -807,7 +804,7 @@ static void mwait_idle(void)
        update_idle_stats(power, cx, before, after);
        local_irq_enable();
 
-       if (!(lapic_timer_reliable_states & (1 << cstate)))
+       if (!(lapic_timer_reliable_states & (1 << cx->type)))
                lapic_timer_on();
 
        rcu_idle_exit(cpu);
--
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