From: Sean Christopherson <seanjc@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, Like Xu <like.xu.linux@gmail.com>
Subject: [PATCH v2 3/7] perf/x86/core: Drop the unnecessary return value from x86_perf_get_lbr()
Date: Wed, 3 Aug 2022 19:26:54 +0000 [thread overview]
Message-ID: <20220803192658.860033-4-seanjc@google.com> (raw)
In-Reply-To: <20220803192658.860033-1-seanjc@google.com>
Drop the return value from x86_perf_get_lbr() now that there's no stub,
i.e. now that success is guaranteed (which is a bit of a lie since
success was always guaranteed, it's just more obvious now).
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/events/intel/lbr.c | 6 +-----
arch/x86/include/asm/perf_event.h | 2 +-
2 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 4f70fb6c2c1e..b8ad31c52cf0 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1868,10 +1868,8 @@ void __init intel_pmu_arch_lbr_init(void)
* x86_perf_get_lbr - get the LBR records information
*
* @lbr: the caller's memory to store the LBR records information
- *
- * Returns: 0 indicates the LBR info has been successfully obtained
*/
-int x86_perf_get_lbr(struct x86_pmu_lbr *lbr)
+void x86_perf_get_lbr(struct x86_pmu_lbr *lbr)
{
int lbr_fmt = x86_pmu.intel_cap.lbr_format;
@@ -1879,8 +1877,6 @@ int x86_perf_get_lbr(struct x86_pmu_lbr *lbr)
lbr->from = x86_pmu.lbr_from;
lbr->to = x86_pmu.lbr_to;
lbr->info = (lbr_fmt == LBR_FORMAT_INFO) ? x86_pmu.lbr_info : 0;
-
- return 0;
}
EXPORT_SYMBOL_GPL(x86_perf_get_lbr);
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index aba196172500..102fd3ad4605 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -512,7 +512,7 @@ extern int x86_perf_rdpmc_index(struct perf_event *event);
#ifdef CONFIG_CPU_SUP_INTEL
extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data);
-extern int x86_perf_get_lbr(struct x86_pmu_lbr *lbr);
+extern void x86_perf_get_lbr(struct x86_pmu_lbr *lbr);
extern void intel_pt_handle_vmx(int on);
#endif /* CONFIG_CPU_SUP_INTEL */
--
2.37.1.559.g78731f0fdb-goog
next prev parent reply other threads:[~2022-08-03 19:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 19:26 [PATCH v2 0/7] KVM: x86: Intel PERF_CAPABILITIES fixes and cleanups Sean Christopherson
2022-08-03 19:26 ` [PATCH v2 1/7] KVM: x86: Refresh PMU after writes to MSR_IA32_PERF_CAPABILITIES Sean Christopherson
2022-08-03 19:26 ` [PATCH v2 2/7] perf/x86/core: Remove unnecessary stubs provided for KVM-only helpers Sean Christopherson
2022-08-04 8:49 ` Like Xu
2022-08-04 15:07 ` Sean Christopherson
2022-08-03 19:26 ` Sean Christopherson [this message]
2022-08-03 19:26 ` [PATCH v2 4/7] KVM: VMX: Advertise PMU LBRs if and only if perf supports LBRs Sean Christopherson
2022-08-03 19:26 ` [PATCH v2 5/7] KVM: VMX: Use proper type-safe functions for vCPU => LBRs helpers Sean Christopherson
2022-08-03 19:26 ` [PATCH v2 6/7] KVM: VMX: Adjust number of LBR records for PERF_CAPABILITIES at refresh Sean Christopherson
2022-08-03 19:26 ` [PATCH v2 7/7] KVM: VMX: Simplify capability check when handling PERF_CAPABILITIES write Sean Christopherson
2022-08-04 7:52 ` Like Xu
2022-08-04 15:00 ` Sean Christopherson
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