From: Markus Metzger <markus.t.metzger@intel.com>
Date: Tue, 16 Dec 2008 14:53:11 +0000 (+0100)
Subject: x86, bts: correctly report invalid bts records
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d072c25f531c6513994960401d2c7f059434c0d2;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

x86, bts: correctly report invalid bts records

Impact: change the reporting of empty BTS records

Correctly report a cleared BTS record as invalid. Used to be reported
as branch from 0 to 0.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 0dc795951d73..98d271e60e08 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -484,6 +484,9 @@ static int bts_read(struct bts_tracer *tracer, const void *at,
 		out->qualifier = bts_branch;
 		out->variant.lbr.from = bts_get(at, bts_from);
 		out->variant.lbr.to   = bts_get(at, bts_to);
+
+		if (!out->variant.lbr.from && !out->variant.lbr.to)
+			out->qualifier = bts_invalid;
 	}
 
 	return ds_cfg.sizeof_rec[ds_bts];