linux-kernel - Re: [PATCH v2 1/5] cpu/speculation: Add 'mitigations=' cmdline option

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Date:   Tue, 16 Apr 2019 10:32:37 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Kosina <jikos@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jon Masters <jcm@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tyler Hicks <tyhicks@...onical.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Steven Price <steven.price@....com>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH v2 1/5] cpu/speculation: Add 'mitigations=' cmdline option

On Tue, Apr 16, 2019 at 04:13:35PM +0200, Borislav Petkov wrote:
> On Fri, Apr 12, 2019 at 03:39:28PM -0500, Josh Poimboeuf wrote:
> > diff --git a/kernel/cpu.c b/kernel/cpu.c
> > index 38890f62f9a8..aed9083f8eac 100644
> > --- a/kernel/cpu.c
> > +++ b/kernel/cpu.c
> > @@ -2320,3 +2320,18 @@ void __init boot_cpu_hotplug_init(void)
> >  #endif
> >  	this_cpu_write(cpuhp_state.state, CPUHP_ONLINE);
> >  }
> > +
> > +enum cpu_mitigations cpu_mitigations __ro_after_init = CPU_MITIGATIONS_AUTO;
> > +
> > +static int __init mitigations_cmdline(char *arg)
> 
> Forgot the verb: "mitigations_parse_cmdline".

Sure.

diff --git a/kernel/cpu.c b/kernel/cpu.c
index aed9083f8eac..cf9fea42d8fc 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2323,7 +2323,7 @@ void __init boot_cpu_hotplug_init(void)
 
 enum cpu_mitigations cpu_mitigations __ro_after_init = CPU_MITIGATIONS_AUTO;
 
-static int __init mitigations_cmdline(char *arg)
+static int __init mitigations_parse_cmdline(char *arg)
 {
 	if (!strcmp(arg, "off"))
 		cpu_mitigations = CPU_MITIGATIONS_OFF;
@@ -2334,4 +2334,4 @@ static int __init mitigations_cmdline(char *arg)
 
 	return 0;
 }
-early_param("mitigations", mitigations_cmdline);
+early_param("mitigations", mitigations_parse_cmdline);