linux-kernel - [PATCH 2/3] x86/tsc: Remove unused "US_SCALE" and "NS

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Date:   Fri, 24 Jul 2020 13:44:17 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>
Subject: [PATCH 2/3] x86/tsc: Remove unused "US_SCALE" and "NS_SCALE" leftover macros

Last use of them was removed 13 years ago, when the code was converted
to use CYC2NS_SCALE_FACTOR:

  53d517cdbaac: ("x86: scale cyc_2_nsec according to CPU frequency")

The current TSC code uses the 'struct cyc2ns_data' scaling abstraction,
the old fixed scaling approach is long gone.

This cleanup also removes the 'arbitralrily' typo from the comment,
so win-win. ;-)

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 arch/x86/include/asm/tsc.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 8a0c25c6bf09..b7b2624fba86 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -7,9 +7,6 @@
 
 #include <asm/processor.h>
 
-#define NS_SCALE	10 /* 2^10, carefully chosen */
-#define US_SCALE	32 /* 2^32, arbitralrily chosen */
-
 /*
  * Standard way to access the cycle counter.
  */
-- 
2.25.1