linux-kernel - [PATCH 2/2] perf/x86/intel/lbr: Fix the return type of get_lbr

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Message-Id: <20201125213720.15692-2-kan.liang@linux.intel.com>
Date:   Wed, 25 Nov 2020 13:37:20 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, ak@...ux.intel.com,
        Kan Liang <kan.liang@...ux.intel.com>, stable@...r.kernel.org
Subject: [PATCH 2/2] perf/x86/intel/lbr: Fix the return type of get_lbr_cycles()

From: Kan Liang <kan.liang@...ux.intel.com>

The cycle count of a timed LBR is always 1 in perf record -D.

The cycle count is stored in the first 16 bits of the IA32_LBR_x_INFO
register, but the get_lbr_cycles() return Boolean type.

Use u16 to replace the Boolean type.

Fixes: 47125db27e47 ("perf/x86/intel/lbr: Support Architectural LBR")
Reported-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: stable@...r.kernel.org
---
 arch/x86/events/intel/lbr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 1aadb253d296..21890dacfcfe 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -919,7 +919,7 @@ static __always_inline bool get_lbr_predicted(u64 info)
 	return !(info & LBR_INFO_MISPRED);
 }
 
-static __always_inline bool get_lbr_cycles(u64 info)
+static __always_inline u16 get_lbr_cycles(u64 info)
 {
 	if (static_cpu_has(X86_FEATURE_ARCH_LBR) &&
 	    !(x86_pmu.lbr_timed_lbr && info & LBR_INFO_CYC_CNT_VALID))
-- 
2.17.1