[PATCH RFC 8/8] powerpc/64: barrier_nospec: Add commandline trigger

From: Michal Suchanek <msuchanek@suse.de>
To: linuxppc-dev@lists.ozlabs.org
Cc: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Michal Suchanek" <msuchanek@suse.de>,
	"Kate Stewart" <kstewart@linuxfoundation.org>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Philippe Ombredanne" <pombredanne@nexb.com>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Tobin C. Harding" <me@tobin.cc>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Michael Neuling" <mikey@neuling.org>,
	"Oliver O'Halloran" <oohall@gmail.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
	"Madhavan Srinivasan" <maddy@linux.vnet.ibm.com>,
	"Masami Hiramatsu" <mhiramat@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Balbir Singh" <bsingharora@gmail.com>,
	"Sergey Senozhatsky" <sergey.senozhatsky@gmail.com>,
	"Christophe Leroy" <christophe.leroy@c-s.fr>,
	"Andrew Donnellan" <andrew.donnellan@au1.ibm.com>,
	"Daniel Axtens" <dja@axtens.net>,
	"Russell Currey" <ruscur@russell.cc>,
	"Joe Perches" <joe@perches.com>,
	"Bryant G. Ly" <bryantly@linux.vnet.ibm.com>,
	"Cédric Le Goater" <clg@kaod.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH RFC 8/8] powerpc/64: barrier_nospec: Add commandline trigger
Date: Tue, 13 Mar 2018 19:33:06 +0100	[thread overview]
Message-ID: <8639fc8cb02548d478b041c3a00ad9053fdd8bc4.1520965380.git.msuchanek@suse.de> (raw)
In-Reply-To: <cover.1520965380.git.msuchanek@suse.de>
In-Reply-To: <cover.1520965380.git.msuchanek@suse.de>

Copypasta from rfi implementation

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kernel/setup_64.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 4b67b7b877d9..257f0e6be107 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -840,6 +840,14 @@ static int __init handle_no_pti(char *p)
 }
 early_param("nopti", handle_no_pti);
 
+static int __init handle_no_nospec(char *p)
+{
+	pr_info("barrier_nospec: disabled on command line.");
+	no_nospec = true;
+	return 0;
+}
+early_param("no_nospec", handle_no_nospec);
+
 static void do_nothing(void *unused)
 {
 	/*
-- 
2.13.6
