perf_counter, x86: rename bitmasks to ->used_mask and ->active_mask

Standardize on explicitly mentioning '_mask' in fields that
are not plain flags but masks. This avoids typos like:

       if (cpuc->used)

(which could easily slip through review unnoticed), while if a
typo looks like this:

       if (cpuc->used_mask)

it might get noticed during review.

[ Impact: cleanup ]

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1241016956-24648-1-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 47e563b..fc06f4d 100644 (file)
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -28,8 +28,8 @@ static u64 perf_counter_mask __read_mostly;
 
 struct cpu_hw_counters {
        struct perf_counter     *counters[X86_PMC_IDX_MAX];
-       unsigned long           used[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
-       unsigned long           active[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
+       unsigned long           used_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
+       unsigned long           active_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
        unsigned long           interrupts;
        u64                     throttle_ctrl;
        int                     enabled;
@@ -332,7 +332,7 @@ static u64 amd_pmu_save_disable_all(void)
        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                u64 val;
 
-               if (!test_bit(idx, cpuc->active))
+               if (!test_bit(idx, cpuc->active_mask))
                        continue;
                rdmsrl(MSR_K7_EVNTSEL0 + idx, val);
                if (!(val & ARCH_PERFMON_EVENTSEL0_ENABLE))
@@ -373,7 +373,7 @@ static void amd_pmu_restore_all(u64 ctrl)
        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                u64 val;
 
-               if (!test_bit(idx, cpuc->active))
+               if (!test_bit(idx, cpuc->active_mask))
                        continue;
                rdmsrl(MSR_K7_EVNTSEL0 + idx, val);
                if (val & ARCH_PERFMON_EVENTSEL0_ENABLE)
@@ -576,7 +576,7 @@ static int x86_pmu_enable(struct perf_counter *counter)
                 * Try to get the fixed counter, if that is already taken
                 * then try to get a generic counter:
                 */
-               if (test_and_set_bit(idx, cpuc->used))
+               if (test_and_set_bit(idx, cpuc->used_mask))
                        goto try_generic;
 
                hwc->config_base = MSR_ARCH_PERFMON_FIXED_CTR_CTRL;
@@ -590,14 +590,14 @@ static int x86_pmu_enable(struct perf_counter *counter)
        } else {
                idx = hwc->idx;
                /* Try to get the previous generic counter again */
-               if (test_and_set_bit(idx, cpuc->used)) {
+               if (test_and_set_bit(idx, cpuc->used_mask)) {
 try_generic:
-                       idx = find_first_zero_bit(cpuc->used,
+                       idx = find_first_zero_bit(cpuc->used_mask,
                                                  x86_pmu.num_counters);
                        if (idx == x86_pmu.num_counters)
                                return -EAGAIN;
 
-                       set_bit(idx, cpuc->used);
+                       set_bit(idx, cpuc->used_mask);
                        hwc->idx = idx;
                }
                hwc->config_base  = x86_pmu.eventsel;
@@ -609,7 +609,7 @@ try_generic:
        x86_pmu.disable(hwc, idx);
 
        cpuc->counters[idx] = counter;
-       set_bit(idx, cpuc->active);
+       set_bit(idx, cpuc->active_mask);
 
        x86_perf_counter_set_period(counter, hwc, idx);
        x86_pmu.enable(hwc, idx);
@@ -643,7 +643,7 @@ void perf_counter_print_debug(void)
                pr_info("CPU#%d: overflow:   %016llx\n", cpu, overflow);
                pr_info("CPU#%d: fixed:      %016llx\n", cpu, fixed);
        }
-       pr_info("CPU#%d: used:       %016llx\n", cpu, *(u64 *)cpuc->used);
+       pr_info("CPU#%d: used:       %016llx\n", cpu, *(u64 *)cpuc->used_mask);
 
        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                rdmsrl(x86_pmu.eventsel + idx, pmc_ctrl);
@@ -677,7 +677,7 @@ static void x86_pmu_disable(struct perf_counter *counter)
         * Must be done before we disable, otherwise the nmi handler
         * could reenable again:
         */
-       clear_bit(idx, cpuc->active);
+       clear_bit(idx, cpuc->active_mask);
        x86_pmu.disable(hwc, idx);
 
        /*
@@ -692,7 +692,7 @@ static void x86_pmu_disable(struct perf_counter *counter)
         */
        x86_perf_counter_update(counter, hwc, idx);
        cpuc->counters[idx] = NULL;
-       clear_bit(idx, cpuc->used);
+       clear_bit(idx, cpuc->used_mask);
 }
 
 /*
@@ -741,7 +741,7 @@ again:
                struct perf_counter *counter = cpuc->counters[bit];
 
                clear_bit(bit, (unsigned long *) &status);
-               if (!test_bit(bit, cpuc->active))
+               if (!test_bit(bit, cpuc->active_mask))
                        continue;
 
                intel_pmu_save_and_restart(counter);
@@ -779,7 +779,7 @@ static int amd_pmu_handle_irq(struct pt_regs *regs, int nmi)
 
        ++cpuc->interrupts;
        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
-               if (!test_bit(idx, cpuc->active))
+               if (!test_bit(idx, cpuc->active_mask))
                        continue;
                counter = cpuc->counters[idx];
                hwc = &counter->hw;