linux-kernel - [tip: x86/cleanups] x86/nospec: Remove unused RSB_FILL

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Message-ID: <157795963208.30329.11151985298082895162.tip-bot2@tip-bot2>
Date:   Thu, 02 Jan 2020 10:07:12 -0000
From:   "tip-bot2 for Anthony Steinhauser" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Anthony Steinhauser <asteinhauser@...gle.com>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "x86-ml" <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/cleanups] x86/nospec: Remove unused RSB_FILL_LOOPS

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     fae7bfcc78146057ac2730719de8d5e41de19540
Gitweb:        https://git.kernel.org/tip/fae7bfcc78146057ac2730719de8d5e41de19540
Author:        Anthony Steinhauser <asteinhauser@...gle.com>
AuthorDate:    Thu, 26 Dec 2019 12:45:12 -08:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Thu, 02 Jan 2020 10:54:53 +01:00

x86/nospec: Remove unused RSB_FILL_LOOPS

It was never really used, see

  117cc7a908c8 ("x86/retpoline: Fill return stack buffer on vmexit")

  [ bp: Massage. ]

Signed-off-by: Anthony Steinhauser <asteinhauser@...gle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/20191226204512.24524-1-asteinhauser@google.com
---
 arch/x86/include/asm/nospec-branch.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 5c24a7b..07e95dc 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -37,7 +37,6 @@
  */
 
 #define RSB_CLEAR_LOOPS		32	/* To forcibly overwrite all entries */
-#define RSB_FILL_LOOPS		16	/* To avoid underflow */
 
 /*
  * Google experimented with loop-unrolling and this turned out to be