perf: Don't use -ENOSPC for out of PMU resources

People (Linus) objected to using -ENOSPC to signal not having enough
resources on the PMU to satisfy the request. Use -EINVAL.

Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-xv8geaz2zpbjhlx0svmpp28n@git.kernel.org
[ merged to newer kernel, fixed up MIPS impact ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 24e2347..ff17b17 100644 (file)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -347,15 +347,15 @@ validate_group(struct perf_event *event)
        memset(&fake_pmu, 0, sizeof(fake_pmu));
 
        if (!validate_event(&fake_pmu, leader))
-               return -ENOSPC;
+               return -EINVAL;
 
        list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
                if (!validate_event(&fake_pmu, sibling))
-                       return -ENOSPC;
+                       return -EINVAL;
        }
 
        if (!validate_event(&fake_pmu, event))
-               return -ENOSPC;
+               return -EINVAL;
 
        return 0;
 }

diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index 4f2971b..315fc0b 100644 (file)
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -623,7 +623,7 @@ static int mipspmu_event_init(struct perf_event *event)
        if (!atomic_inc_not_zero(&active_events)) {
                if (atomic_read(&active_events) > MIPS_MAX_HWEVENTS) {
                        atomic_dec(&active_events);
-                       return -ENOSPC;
+                       return -EINVAL;
                }
 
                mutex_lock(&pmu_reserve_mutex);
@@ -732,15 +732,15 @@ static int validate_group(struct perf_event *event)
        memset(&fake_cpuc, 0, sizeof(fake_cpuc));
 
        if (!validate_event(&fake_cpuc, leader))
-               return -ENOSPC;
+               return -EINVAL;
 
        list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
                if (!validate_event(&fake_cpuc, sibling))
-                       return -ENOSPC;
+                       return -EINVAL;
        }
 
        if (!validate_event(&fake_cpuc, event))
-               return -ENOSPC;
+               return -EINVAL;
 
        return 0;
 }

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 6408910..ff0e8d4 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -588,7 +588,7 @@ done:
                                x86_pmu.put_event_constraints(cpuc, cpuc->event_list[i]);
                }
        }
-       return num ? -ENOSPC : 0;
+       return num ? -EINVAL : 0;
 }
 
 /*
@@ -607,7 +607,7 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,
 
        if (is_x86_event(leader)) {
                if (n >= max_count)
-                       return -ENOSPC;
+                       return -EINVAL;
                cpuc->event_list[n] = leader;
                n++;
        }
@@ -620,7 +620,7 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,
                        continue;
 
                if (n >= max_count)
-                       return -ENOSPC;
+                       return -EINVAL;
 
                cpuc->event_list[n] = event;
                n++;
@@ -1316,7 +1316,7 @@ static int validate_event(struct perf_event *event)
        c = x86_pmu.get_event_constraints(fake_cpuc, event);
 
        if (!c || !c->weight)
-               ret = -ENOSPC;
+               ret = -EINVAL;
 
        if (x86_pmu.put_event_constraints)
                x86_pmu.put_event_constraints(fake_cpuc, event);
@@ -1341,7 +1341,7 @@ static int validate_group(struct perf_event *event)
 {
        struct perf_event *leader = event->group_leader;
        struct cpu_hw_events *fake_cpuc;
-       int ret = -ENOSPC, n;
+       int ret = -EINVAL, n;
 
        fake_cpuc = allocate_fake_cpuc();
        if (IS_ERR(fake_cpuc))

diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c
index 492bf13..ef484d9 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_p4.c
+++ b/arch/x86/kernel/cpu/perf_event_p4.c
@@ -1268,7 +1268,7 @@ reserve:
        }
 
 done:
-       return num ? -ENOSPC : 0;
+       return num ? -EINVAL : 0;
 }
 
 static __initconst const struct x86_pmu p4_pmu = {