linux-kernel - [PATCH] tools/power/x86/turbostat: Fix TCC offset bit mask

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Date:   Sat, 16 Jan 2021 09:07:25 -0800
From:   Doug Smythies <doug.smythies@...il.com>
To:     lenb@...nel.org
Cc:     dsmythies@...us.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH] tools/power/x86/turbostat: Fix TCC offset bit mask

The TCC offset mask is incorrect, resulting in
incorrect target temperature calculations, if
the offset is big enough to exceed the mask size.

Signed-off-by: Doug Smythies <dsmythies@...us.net>
---
 tools/power/x86/turbostat/turbostat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 389ea5209a83..d7acdd4d16c4 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -4823,7 +4823,7 @@ int read_tcc_activation_temp()
 
 	target_c = (msr >> 16) & 0xFF;
 
-	offset_c = (msr >> 24) & 0xF;
+	offset_c = (msr >> 24) & 0x3F;
 
 	tcc = target_c - offset_c;
 
-- 
2.25.1