linux-kernel - [PATCH 3.16 47/86] x86/speculation: Unify conditional spectre v2 print functions

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Message-ID: <lsq.1558022133.373391552@decadent.org.uk>
Date:   Thu, 16 May 2019 16:55:33 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Arjan van de Ven" <arjan@...ux.intel.com>,
        "Andrea Arcangeli" <aarcange@...hat.com>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        "Tom Lendacky" <thomas.lendacky@....com>,
        "Greg KH" <gregkh@...uxfoundation.org>,
        "Casey Schaufler" <casey.schaufler@...el.com>,
        "Tim Chen" <tim.c.chen@...ux.intel.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Dave Stewart" <david.c.stewart@...el.com>,
        "Jon Masters" <jcm@...hat.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Waiman Long" <longman9394@...il.com>,
        "David Woodhouse" <dwmw@...zon.co.uk>,
        "Asit Mallick" <asit.k.mallick@...el.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Kees Cook" <keescook@...omium.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Jiri Kosina" <jkosina@...e.cz>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Andi Kleen" <ak@...ux.intel.com>, "Ingo Molnar" <mingo@...nel.org>
Subject: [PATCH 3.16 47/86] x86/speculation: Unify conditional spectre v2
 print functions

3.16.68-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@...utronix.de>

commit 495d470e9828500e0155027f230449ac5e29c025 upstream.

There is no point in having two functions and a conditional at the call
site.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Casey Schaufler <casey.schaufler@...el.com>
Cc: Asit Mallick <asit.k.mallick@...el.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Jon Masters <jcm@...hat.com>
Cc: Waiman Long <longman9394@...il.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Dave Stewart <david.c.stewart@...el.com>
Cc: Kees Cook <keescook@...omium.org>
Link: https://lkml.kernel.org/r/20181125185004.986890749@linutronix.de
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/kernel/cpu/bugs.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -312,15 +312,9 @@ static const struct {
 	{ "auto",		SPECTRE_V2_CMD_AUTO,		  false },
 };
 
-static void __init spec2_print_if_insecure(const char *reason)
+static void __init spec_v2_print_cond(const char *reason, bool secure)
 {
-	if (boot_cpu_has_bug(X86_BUG_SPECTRE_V2))
-		pr_info("%s selected on command line.\n", reason);
-}
-
-static void __init spec2_print_if_secure(const char *reason)
-{
-	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2))
+	if (boot_cpu_has_bug(X86_BUG_SPECTRE_V2) != secure)
 		pr_info("%s selected on command line.\n", reason);
 }
 
@@ -368,11 +362,8 @@ static enum spectre_v2_mitigation_cmd __
 		return SPECTRE_V2_CMD_AUTO;
 	}
 
-	if (mitigation_options[i].secure)
-		spec2_print_if_secure(mitigation_options[i].option);
-	else
-		spec2_print_if_insecure(mitigation_options[i].option);
-
+	spec_v2_print_cond(mitigation_options[i].option,
+			   mitigation_options[i].secure);
 	return cmd;
 }