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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Rian Hunter <rian@alum.mit.edu>,
        Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andy Lutomirski <luto@kernel.org>,
        Borislav Petkov <bpetkov@suse.de>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Joerg Roedel <jroedel@suse.de>,
        Dmitry Safonov <dima@arista.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>
Subject: [PATCH 4.18 055/123] x86/process: Re-export start_thread()
Date:   Mon,  3 Sep 2018 18:56:39 +0200
Message-Id: <20180903165721.774368489@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Rian Hunter <rian@alum.mit.edu>

commit dc76803e57cc86589c4efcb5362918f9b0c0436f upstream.

The consolidation of the start_thread() functions removed the export
unintentionally. This breaks binfmt handlers built as a module.

Add it back.

Fixes: e634d8fc792c ("x86-64: merge the standard and compat start_thread() functions")
Signed-off-by: Rian Hunter <rian@alum.mit.edu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Dmitry Safonov <dima@arista.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180819230854.7275-1-rian@alum.mit.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/process_64.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -384,6 +384,7 @@ start_thread(struct pt_regs *regs, unsig
 	start_thread_common(regs, new_ip, new_sp,
 			    __USER_CS, __USER_DS, 0);
 }
+EXPORT_SYMBOL_GPL(start_thread);
 
 #ifdef CONFIG_COMPAT
 void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp)