From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:53588 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755852AbeAHIB6 (ORCPT ); Mon, 8 Jan 2018 03:01:58 -0500 Subject: Patch "x86/tlb: Drop the _GPL from the cpu_tlbstate export" has been added to the 4.4-stable tree To: tglx@linutronix.de, gregkh@linuxfoundation.org, keescook@google.com, luto@kernel.org, peterz@infradead.org, tmb@mageia.org Cc: , From: Date: Mon, 08 Jan 2018 09:02:02 +0100 Message-ID: <151539852217534@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled x86/tlb: Drop the _GPL from the cpu_tlbstate export to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 1e5476815fd7f98b888e01a0f9522b63085f96c9 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 4 Jan 2018 22:19:04 +0100 Subject: x86/tlb: Drop the _GPL from the cpu_tlbstate export From: Thomas Gleixner commit 1e5476815fd7f98b888e01a0f9522b63085f96c9 upstream. The recent changes for PTI touch cpu_tlbstate from various tlb_flush inlines. cpu_tlbstate is exported as GPL symbol, so this causes a regression when building out of tree drivers for certain graphics cards. Aside of that the export was wrong since it was introduced as it should have been EXPORT_PER_CPU_SYMBOL_GPL(). Use the correct PER_CPU export and drop the _GPL to restore the previous state which allows users to utilize the cards they payed for. As always I'm really thrilled to make this kind of change to support the #friends (or however the hot hashtag of today is spelled) from that closet sauce graphics corp. Fixes: 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4") Fixes: 6fd166aae78c ("x86/mm: Use/Fix PCID to optimize user/kernel switches") Reported-by: Kees Cook Signed-off-by: Thomas Gleixner Cc: Greg Kroah-Hartman Cc: Peter Zijlstra Cc: Andy Lutomirski Cc: Thomas Backlund Signed-off-by: Greg Kroah-Hartman --- arch/x86/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -757,7 +757,7 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb .state = 0, .cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */ }; -EXPORT_SYMBOL_GPL(cpu_tlbstate); +EXPORT_PER_CPU_SYMBOL(cpu_tlbstate); void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache) { Patches currently in stable-queue which might be from tglx@linutronix.de are queue-4.4/x86-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.patch queue-4.4/x86-kasan-write-protect-kasan-zero-shadow.patch queue-4.4/x86-microcode-amd-add-support-for-fam17h-microcode-loading.patch