linux-kernel - [PATCH RFC 8/8] powerpc/64: barrier

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Message-Id: <8639fc8cb02548d478b041c3a00ad9053fdd8bc4.1520965380.git.msuchanek@suse.de>
Date:   Tue, 13 Mar 2018 19:33:06 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Nicholas Piggin <npiggin@...il.com>,
        "Tobin C. Harding" <me@...in.cc>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Al Viro <viro@...iv.linux.org.uk>,
        Michael Neuling <mikey@...ling.org>,
        "Oliver O'Halloran" <oohall@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Balbir Singh <bsingharora@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Russell Currey <ruscur@...sell.cc>,
        Joe Perches <joe@...ches.com>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 8/8] powerpc/64: barrier_nospec: Add commandline trigger

Copypasta from rfi implementation

Signed-off-by: Michal Suchanek <msuchanek@...e.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